A Complete Resource Book in Chemistry for JEE Main

A.K. Singhal

Chapter 18

Chemistry of Heavier Elements (Metallurgy) - all with Video Answers

Educators

CC

Chapter Questions

Problem 1

Iron loses its magnetic property at
(a) boiling point
(b) melting point
(c) $1000 \mathrm{~K}$
(d) curie point

Vishal Sharma

Vishal Sharma

Numerade Educator

Problem 2

The purest form of iron is
(a) pig iron
(b) wrought iron
(c) red iron
(d) steel

Vishal Sharma

Numerade Educator

Problem 3

Which of the follwoing reaction occurs in the com. bustion zone of the blast furnace during the extractior of iron?
(a) $\mathrm{CO}_{2}+\mathrm{C} \longrightarrow 2 \mathrm{CO}$
(b) $\mathrm{CaO}+\mathrm{SiO}_{2} \longrightarrow \mathrm{CaSiO}_{3}$
(c) $\mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2}$
(d) $\mathrm{FeO}+\mathrm{CO} \longrightarrow \mathrm{Fe}+\mathrm{CO}_{2}$

Ramesh Singh

Numerade Educator

Problem 4

Which of the following is used to reduce pure haematite to iron?
(a) $\mathrm{CO}$
(b) $\mathrm{H}_{2} / \mathrm{Pd}$
(c) $\mathrm{LiAlH}_{4}$
(d) $\mathrm{H}_{2}$

Vishal Sharma

Numerade Educator

Problem 5

Which of the following is formed when ferrous oxalate is heated in the absence of air?
(a) $\mathrm{Fe}_{2} \mathrm{O}_{3}$
(b) $\mathrm{Fe}_{3} \mathrm{O}_{4}$
(c) $\mathrm{Fe}_{2} \mathrm{O}_{4}$
(d) $\mathrm{FeO}$

Vishal Sharma

Numerade Educator

Problem 6

On igniting $\mathrm{Fe}_{2} \mathrm{O}_{3}$ at 1673
(a) $\mathrm{Fe}_{2} \mathrm{O}_{3}$ starts melting
(b) $\mathrm{FeO}$ is formed
(c) metallic iron is formed
(d) both (b) and (c)

Vishal Sharma

Numerade Educator

Problem 7

Ferric iron forms a prussian blue coloured precipitate with $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$, due to the formation of
(a) $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$
(b) $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
(c) $\mathrm{K}_{3}[\mathrm{Fe}(\mathrm{CN})]$
(d) $\mathrm{Fe}(\mathrm{CNS})_{3}$

Vishal Sharma

Numerade Educator

Problem 8

Thermite is a mixture of
(a) $\mathrm{Zn}+\mathrm{CaCO}_{3}$
(b) $\mathrm{MgO}+\mathrm{Al}$
(c) $\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{Al}$
(d) $\mathrm{Zn}+\mathrm{P}_{2} \mathrm{O}_{5}$

Vishal Sharma

Numerade Educator

Problem 9

Stainless steel vessels are made from steel containing
(a) $\mathrm{W}$
(b) $\mathrm{Mn}$
(c) $\mathrm{Cr}$
(d) $\mathrm{Ni}$

Vishal Sharma

Numerade Educator

Problem 10

Cassiterite is concentrated by
(a) hand picking
(b) levigation
(c) electromagnetic separation
(d) Wilfley table method

Vishal Sharma

Numerade Educator

Problem 11

Galena ore is concentrated by
(a) gravity separation
(b) froth flotation process
(c) magnetic separation
(d) roasting

Vishal Sharma

Numerade Educator

Problem 12

Wolframite ore is separated from tinstone ore by the process of
(a) smelting
(b) calcination
(c) roasting
(d) electromagnetic

Vishal Sharma

Numerade Educator

Problem 13

In the manufacture of iron from haematite, lime stone is added to act as an
(a) slage
(b) reducing agent
(c) oxidizing agent
(d) flux

Vishal Sharma

Numerade Educator

Problem 14

Tin stone is contaminated with Wolframite. Which one of the following methods can be employed to dress the tin stone ore?
(a) electromagnetic separation
(b) levigation
(c) roasting
(d) floatation process

Vishal Sharma

Numerade Educator

Problem 15

Identify the reaction that does not take place during the smelting process of copper extraction.
(a) $\mathrm{Cu}_{2} \mathrm{O}+\mathrm{FeS} \longrightarrow \mathrm{Cu}_{2} \mathrm{~S}+\mathrm{FeO}$
(b) $\mathrm{FeO}+\mathrm{SiO}_{2} \longrightarrow \mathrm{FeSiO}_{3}$
(c) $2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \longrightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} \uparrow$
(d) $2 \mathrm{FeS}+3 \mathrm{O}_{2} \longrightarrow 2 \mathrm{FeO}+2 \mathrm{SO}_{2} \uparrow$

Vishal Sharma

Numerade Educator

Problem 16

Which of the following is obtained when $\mathrm{Fe}$ reacts with dil $\mathrm{HNO}_{3}$ ?
(a) NO
(b) $\mathrm{N}_{2} \mathrm{O}$
(c) $\mathrm{NO}_{2}$
(d) none of these

Vishal Sharma

Numerade Educator

Problem 17

In the extraction of iron slag is produced which is
(a) $\mathrm{CaSiO}_{3}$
(b) $\mathrm{FeSiO}_{3}$
(c) $\mathrm{CO}$
(d) $\mathrm{MgSiO}_{3}$

Vishal Sharma

Numerade Educator

Problem 18

The oxidation number of $\mathrm{Fe}$ in $\mathrm{Fe}_{3} \mathrm{O}_{4}$ is
(a) $+2$
(b) $2 / 3$
(c) $+3$
(d) $8 / 3$

Vishal Sharma

Numerade Educator

Problem 19

Iron sulphide is heated in air to form $\mathrm{A}$, an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is
(a) zero
(b) 1
(c) 2
(d) 3

Vishal Sharma

Numerade Educator

Problem 20

Which of the following gives blood red colour with KCNS?
(a) $\mathrm{Al}^{3+}$
(b) $\mathrm{Zn}^{2+}$
(c) $\mathrm{Fe}^{3+}$
(d) $\mathrm{Cu}^{2+}$

Vishal Sharma

Numerade Educator

Problem 21

The iron obtained from blast furnace is
(a) soft iron
(b) pig iron
(c) steel
(d) wrought iron

Vishal Sharma

Numerade Educator

Problem 22

If steel is heated to a temperature well below where it becomes red hot and is then cooled slowly, the process is called
(a) hardening
(b) tempering
(c) annealing
(d) softening

Vishal Sharma

Numerade Educator

Problem 23

Which of the following is a highly corrosive salt?
(a) $\mathrm{FeCl}_{2}$
(b) $\mathrm{HgCl}_{2}$
(c) $\mathrm{PbCl}_{2}$
(d) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$

Narayan Hari

Numerade Educator

Problem 24

The nature of an aqueous solution of $\mathrm{FeCl}_{2}$ is
(a) basic
(b) acidic
(c) amphoteric
(d) neutral

Vishal Sharma

Numerade Educator

Problem 25

The number of ions formed on dissolving one molecule of $\mathrm{FeSO}_{4}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O}$ is
(a) 6
(b) 5
(c) 4
(d) 3

Vishal Sharma

Numerade Educator

Problem 26

What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide is treated with $\mathrm{H}_{2} \mathrm{O}_{2} ?$
(a) $+2$
(b) $+6$
(c) $+1$
(d) $+3$

Vishal Sharma

Numerade Educator

Problem 27

Chromite ore can be given as
(a) $\mathrm{FeCr}_{2} \mathrm{O}_{7}$
(b) $\mathrm{Cr}_{2} \mathrm{O}_{3}$
(c) $\mathrm{FeCr}_{2} \mathrm{O}_{4}$
(d) $\mathrm{Fe}_{3} \mathrm{O}_{4}$

Vishal Sharma

Numerade Educator

Problem 28

Wrought iron, pig iron and steel differ in properties due to
(a) carbon content
(b) softness
(c) conductivity
(d) malleability

Vishal Sharma

Numerade Educator

Problem 29

Which of the following is not an ore of iron?
(a) magnetite
(b) limonite
(c) cassiterite
(d) haematite

Vishal Sharma

Numerade Educator

Problem 30

Corrosion is basically a
(a) interaction
(b) union between light metal and heavy metal
(c) electrochemical phenomenon
(d) altered reaction in presence of water

Vishal Sharma

Numerade Educator

Problem 31

Ferrosilicon is used in the steel industry as
(a) cutting tool
(b) alloying agent
(c) flux
(d) a reducing agent

Vishal Sharma

Numerade Educator

Problem 32

The ore which contains copper and iron both is
(a) cuprite
(b) chalcocite
(c) chalcopyrite
(d) malachite

Vishal Sharma

Numerade Educator

Problem 33

In the blast furnace, iron oxide is reduced by
(a) silica
(b) carbon
(c) hot blast of air
(d) carbon monoxide

Vishal Sharma

Numerade Educator

Problem 34

The percentage of silver in german silver, is
(a) $0 \%$
(b) $10 \%$
(c) $2.5 \%$
(d) $4.5 \%$

Vishal Sharma

Numerade Educator

Problem 35

Which of the following alloy contains $\mathrm{Cu}$ and $\mathrm{Zn}$ ?
(a) bell metal
(b) aluminium bronze
(c) brass
(d) bronze

Vishal Sharma

Numerade Educator

Problem 36

Bell metal is an alloy of
(a) $\mathrm{Cu}+\mathrm{Sn}$
(b) $\mathrm{Cu}+\mathrm{Zn}$
(c) $\mathrm{Cu}+\mathrm{Ni}$
(d) $\mathrm{Cu}+\mathrm{Pb}$

Vishal Sharma

Numerade Educator

Problem 37

An extremely hot copper wire reacts with steam to give
(a) $\mathrm{Cu}_{2} \mathrm{O}$
(b) $\mathrm{CuO}_{2}$
(c) $\mathrm{Cu}_{2} \mathrm{O}_{2}$
(d) $\mathrm{CuO}$

Alkendra Singh

Numerade Educator

Problem 38

Which of the following is produced, when copper reacts with chlorine?
(a) $\mathrm{CuCl}_{4}$
(b) $\mathrm{Cu}_{2} \mathrm{Cl}$
(c) $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$
(d) $\mathrm{CuCl}_{2}$

Vishal Sharma

Numerade Educator

Problem 39

Which of the following metal does not react with the solution of copper sulphate?
(a) $\mathrm{Fe}$
(b) $\mathrm{Zn}$
(c) $\mathrm{Ag}$
(d) $\mathrm{Mg}$

Vishal Sharma

Numerade Educator

Problem 40

Which of the following metal is present in brass, 5 bronze and german silver?
(a) $\mathrm{Mg}$
(b) $\mathrm{Cu}$
(c) $\mathrm{Al}$
(d) $\mathrm{Na}$

Vishal Sharma

Numerade Educator

Problem 41

Which of the following gas is evolved when cupric sulphide (CuS) is dissolved in dilute hydrochloric acid $(\mathrm{HCl}) ?$
(a) $\mathrm{S}$
(b) $\mathrm{Cl}_{2}$
(c) $\mathrm{H}_{2} \mathrm{~S}$
(d) $\mathrm{H}_{2}$

Vishal Sharma

Numerade Educator

Problem 42

On strongly heating copper nitrate, we get
(a) copper metal
(b) cuprous oxide
(c) cupric oxide
(d) copper sulphate

Vishal Sharma

Numerade Educator

Problem 43

What is formed when $\mathrm{H}_{2} \mathrm{~S}$ is passed through acidified solution of $\mathrm{CuSO}_{4}$ ?
(a) $\mathrm{CuSO}_{4}$
(b) $\mathrm{CuS}$
(c) $\mathrm{CuHSO}_{4}$
(d) $\mathrm{Cu}_{2} \mathrm{~S}$

Vishal Sharma

Numerade Educator

Problem 44

What is produced when cuprous oxide reacts with HCl?
(a) $\mathrm{CuCl}$
(b) $\mathrm{CuO}$
(c) $\mathrm{HCuCl}_{2}$
(d) $\mathrm{CuCl}_{2}$

Vishal Sharma

Numerade Educator

Problem 45

$\mathrm{SO}_{2}$ gas reacts with a solution of $\mathrm{CuSO}_{4}$ and $\mathrm{KCN}$ to produce
(a) a mixture of $\mathrm{Cu}(\mathrm{CNS})_{2}$ and $\mathrm{H}_{2} \mathrm{SO}_{4}$
(b) a complex, $\left[\mathrm{Cu}(\mathrm{CNS})_{4}\right] \mathrm{SO}_{4}$
(c) a white precipitate of $\mathrm{CuCNS}$
(d) both (a) and (c)

Vishal Sharma

Numerade Educator

Problem 46

When excess of dilute $\mathrm{NH}_{4} \mathrm{OH}$ is added to an aqueous solution of $\mathrm{CuSO}_{4}$ an intense blue colour is obtained. This blue colour is due to the presence of
(a) $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
(b) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$
(c) $\mathrm{CuSO}_{4}$
(d) $\mathrm{Cu}(\mathrm{OH})_{2}$

Vishal Sharma

Numerade Educator

Problem 47

Which of the following is formed when cupric oxide reacts with glucose?
(a) $\mathrm{CuCHO}$
(b) $\mathrm{CuO}$
(c) $\mathrm{Cu}_{2} \mathrm{O}$
(d) $\mathrm{C}_{5} \mathrm{H}_{11} \mathrm{O}_{6}$

Ramesh Singh

Numerade Educator

Problem 48

Copper forms nitrogen oxide with dilute nitric acid but with concentrated nitric acid it gives
(a) nitrogen dioxide
(b) nitrogen oxide
(c) nitrogen peroxide
(d) nitrogen trioxide

Vishal Sharma

Numerade Educator

Problem 49

The white anhydrous copper sulphate decomposes to give
(a) $\mathrm{CuO}+\mathrm{SO}_{3}$
(b) $\mathrm{Cu}$
(c) $\mathrm{CuSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 50

Cuprous ore among the following is
(a) cuprite
(b) malachite
(c) chalcopyrites
(d) azurite

Vishal Sharma

Numerade Educator

Problem 51

The percentage of copper, tin and zinc metals present in 'Gun metal' respectively are
(a) $88,2,10$
(b) $88,10,2$
(c) $80,20,0$
(d) $80,0,20$

Vishal Sharma

Numerade Educator

Problem 52

An alkaline solution of ..... and citrate ions is called
(a) silver chloride; Tollen's reagent
(b) cupric sulphate; Benedict's solution
(c) silver nitrate; Fehling's solution
(d) cupric sulphate; Schiff's reagents

Narayan Hari

Numerade Educator

Problem 53

When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as
(a) copper carbonate-copper sulphate
(b) copper sulphate-copper sulphide
(c) copper carbonate-copper hydroxide
(d) copper sulphide-copper carbonate

Vishal Sharma

Numerade Educator

Problem 54

Which of the following metal is found in gun metal, monel metal and constantan alloys?
(a) $\mathrm{Cu}$
(b) $\mathrm{Fe}$
(c) $\mathrm{Hg}$
(d) $\mathrm{Zn}$

Vishal Sharma

Numerade Educator

Problem 55

Cuprous ion is colourless, while cupric ion is coloured, because
(a) cuprous ion has incomplete d orbital and cupric ion has a complete $\mathrm{d}$ orbital
(b) cuprous ion has a complete d orbital and cupric ion has incomplete d orbital
(c) cuprous ion has half filled d orbital
(d) cupric ion has unpaired electrons in d orbital

Vishal Sharma

Numerade Educator

Problem 56

Lunar caustic is
(a) $\mathrm{NaOH}$
(b) $\mathrm{NaNO}_{3}$
(c) $\mathrm{AgNO}_{3}$
(d) $\mathrm{Ag}_{2} \mathrm{SO}_{4}$

Vishal Sharma

Numerade Educator

Problem 57

Silver is present in
(a) galena
(b) magnetite
(c) dolomite
(d) limonite

Vishal Sharma

Numerade Educator

Problem 58

Cyanide process is used in the extraction of
(a) $\mathrm{Cu}$
(b) $\mathrm{Al}$
(c) $\mathrm{Zn}$
(d) $\mathrm{Ag}$

Vishal Sharma

Numerade Educator

Problem 59

$\mathrm{K} 1$ and $\mathrm{CuSO}_{4}$ solution when mixed gives
(a) $\mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2}$
(b) $\mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{K}_{2} \mathrm{SO}_{4}$
(c) $\mathrm{CuI}_{2}+\mathrm{K}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{CuI}_{2}+\mathrm{I}_{2}$

Vishal Sharma

Numerade Educator

Problem 60

Which of the following is used in the extraction of silver?
(a) $\mathrm{NaCN}$
(b) $\mathrm{Na}_{2} \mathrm{SO}_{4}$
(c) $\mathrm{Na}_{2} \mathrm{CO}_{3}$
(d) $\mathrm{NaCl}$

Vishal Sharma

Numerade Educator

Problem 61

Which of the following gas is evolved when silver reacts with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4} ?$
(a) $\mathrm{O}_{2}$
(b) $\mathrm{SO}_{2}$
(c) $\mathrm{Ag}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{H}_{2}$

Vishal Sharma

Numerade Educator

Problem 62

With $\mathrm{NH}_{4} \mathrm{OH}$, the silver nitrate is decomposed to give a brown precipitate of
(a) $\mathrm{Ag}_{2} \mathrm{O}$
(b) $\mathrm{AgO}$
(c) $\mathrm{Ag}(\mathrm{OH})_{2}$
(d) $\mathrm{NH}_{4} \mathrm{NO}_{3}$

Vishal Sharma

Numerade Educator

Problem 63

The solubility of $\mathrm{AgBr}$ in hypo is due to the formation of
(a) $\mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$
(b) $\left[\operatorname{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)\right]^{-}$
(c) $\left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]^{3-}$
(d) $\mathrm{Ag}_{2} \mathrm{SO}_{3}$

Vishal Sharma

Numerade Educator

Problem 64

Which of the following is formed when silver nitrate is treated with caustic soda?
(a) $\mathrm{Ag}_{3} \mathrm{~N}$
(b) $\mathrm{Ag}$
(c) $\mathrm{AgNO}_{2}$
(d) $\mathrm{Ag}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 65

Parke's process is used
(a) to extract Cu using $\mathrm{CuFeS}_{2}$
(b) to extract Ag from argenti ferrous lead
(c) to extract $\mathrm{Ag}$ by forming amalgam
(d) to extract $\mathrm{Ag}$ using $\mathrm{NaCN}$

Vishal Sharma

Numerade Educator

Problem 66

In the extraction of silver, $\mathrm{Ag}_{2} \mathrm{~S}$ is dissolved in
(a) $\mathrm{HNO}_{3}$
(b) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(c) $\mathrm{HCl}$
(d) $\mathrm{KCN}$

Vishal Sharma

Numerade Educator

Problem 67

In the extraction of silver, $\mathrm{Ag}_{2} \mathrm{~S}$ is dissolved in
(a) $\mathrm{HNO}_{3}$
(b) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(c) $\mathrm{HCl}$
(d) $\mathrm{KCN}$

Vishal Sharma

Numerade Educator

Problem 68

Silver containing lead as an impurity is removed by
(a) distillation
(b) poling
(c) levigation
(d) cupellation

Vishal Sharma

Numerade Educator

Problem 69

Which of the following compound of zinc is white in cold and yellow in hot?
(a) $\mathrm{ZnS}$
(b) $\mathrm{ZnCl}_{2}$
(c) $\mathrm{ZnSO}_{4}$
(d) $\mathrm{ZnO}$

Vishal Sharma

Numerade Educator

Problem 70

When sodium argentocyanide is treated with zinc dust, silver precipitates because
(a) zinc forms a complex readily with cyanide
(b) zinc is more electropositive than silver
(c) silver is more electropositive than zinc
(d) both $\mathrm{Zn}^{2+}$ and $\mathrm{Ag}^{+}$ions have $\mathrm{d}^{10}$ electronic configuration

Vishal Sharma

Numerade Educator

Problem 71

Which of the following compound is known as white vitriol?
(a) $\mathrm{ZnSO}_{4^{*}} \cdot 7 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{Na}_{2} \mathrm{SO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}$
(c) $\mathrm{CaCO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{MgSO}_{4^{*}} 7 \mathrm{H}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 72

The important ore of zinc is
(a) cryolite
(b) calamine
(c) malachite
(d) gibbsite

Vishal Sharma

Numerade Educator

Problem 73

$\mathrm{Zn}$, on reacting with cold dil. $\mathrm{HNO}_{3}$ forms
(a) $\mathrm{ZnNO}_{3}$
(b) $\mathrm{NO}_{2}$
(c) $\mathrm{NH}_{4} \mathrm{NO}_{3}$
(d) $\mathrm{NO}$

Vishal Sharma

Numerade Educator

Problem 74

Granulated zinc can be obtained by
(a) adding molten zinc to water
(b) heating zinc from 373 to $423 \mathrm{~K}$
(c) droping molten zinc drop by drop
(d) all of these

Vishal Sharma

Numerade Educator

Problem 75

Zinc does not show variable valency, because
(a) its d-subshell is incomplete
(b) it is relatively soft metal
(c) its d-subshell is complete
(d) it has two electrons in outermost shell
\eta. the reaction

Vishal Sharma

Numerade Educator

Problem 76

In the reaction $\mathrm{Zn}+\mathrm{NaOH} \stackrel{\Delta}{\longrightarrow} \mathrm{A}$, the product $\mathrm{A}$ is
(a) $\mathrm{Zn}(\mathrm{OH})_{2}$
(b) $2 \mathrm{NaZnO}_{2}$
(c) $\mathrm{Na}_{2} \mathrm{ZnO}_{2}$
(d) none of these

Vishal Sharma

Numerade Educator

Problem 77

Anhydrous zinc chloride is prepared by heating of
(a) $\mathrm{ZnCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{Zn}+\mathrm{HgCl}_{2}$
(c) $\mathrm{Zn}+\mathrm{Cl}$
(d) both $(\mathrm{b})$ and $(\mathrm{c})$

Vishal Sharma

Numerade Educator

Problem 78

Zn reacts with concentration $\mathrm{NaOH}$ solution produce
(a) $\mathrm{ZnO}_{2}^{2-}$ and $\mathrm{H}_{2}$
(b) $\mathrm{ZnO}_{2}^{2-}$ only
(c) $\mathrm{ZnO}_{4}^{2-}$ and $\mathrm{H}_{2}$
(d) $\mathrm{ZnO}_{2}^{2-}$ and $\mathrm{O}_{2}$

Vishal Sharma

Numerade Educator

Problem 79

During the extraction of zinc, $\mathrm{ZnO}$ is obtained from zinc blende by
(a) poling
(b) roasting
(c) cupellation
(d) electrolytic reduction

Vishal Sharma

Numerade Educator

Problem 80

Which of the following is formed, when $\mathrm{H}_{2} \mathrm{~S}$ is passed through the solution of sodium zincate?
(a) $\mathrm{Zn}(\mathrm{OH})_{2}$
(b) $\mathrm{ZnS}$
(c) $\mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]$
(d) $\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$

Vishal Sharma

Numerade Educator

Problem 81

Which of the following is used in making ointment for curing skin disease?
(a) $\mathrm{ZnCO}_{3}$
(b) $\mathrm{ZnSO}_{4}$
(c) $\mathrm{ZnO}$
(d) $\mathrm{ZnS}$

Ramesh Singh

Numerade Educator

Problem 82

Brass is an alloy of
(a) $\mathrm{Cu}$ and $\mathrm{Sn}$
(b) $\mathrm{Ag}$ and $\mathrm{Cu}$
(c) $\mathrm{Cu}$ and $\mathrm{Zn}$
(d) $\mathrm{Sn}$ and $\mathrm{Zn}$

Vishal Sharma

Numerade Educator

Problem 83

Cinnabar is an ore of
(a) $\mathrm{Cu}$
(b) $\mathrm{Zn}$
(c) $\mathrm{Hg}$
(d) $\mathrm{Pb}$

Vishal Sharma

Numerade Educator

Problem 84

Which of the following is a calomel?
(a) $\mathrm{HgBr}_{2}$
(b) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$
(c) $\mathrm{HgCl}$,
(d) $\mathrm{HgSO}_{4}$

Vishal Sharma

Numerade Educator

Problem 85

In Nessler's reagent, the ion present is
(a) $\mathrm{HgI}_{4}^{2-}$
(b) $\mathrm{Hg} \mathrm{I}_{2}^{2-}$
(c) $\mathrm{Hg}^{+}$
(d) $\mathrm{Hg}^{2+}$

Vishal Sharma

Numerade Educator

Problem 86

Mercury is transported in metal containers made of
(a) lead
(b) silver
(c) aluminium
(d) iron

Vishal Sharma

Numerade Educator

Problem 87

Mercuric iodide dissolves in excess of KI and forms
(a) $\mathrm{Hg}_{2} \mathrm{I}_{2}$
(b) $\mathrm{Hg}$
(c) $\mathrm{K}_{2}\left[\mathrm{HgI}_{4}\right]$
(d) $\mathrm{K}\left[\mathrm{HgI}_{2}\right]$

Vishal Sharma

Numerade Educator

Problem 88

When mercury boils with $\mathrm{H}_{2} \mathrm{SO}_{4}$, then it formed and is liberated.
(a) $\mathrm{Hg}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2}$
(b) $\mathrm{HgSO}_{4}, \mathrm{SO}_{2}$
(c) $\mathrm{HgSO}_{4}, \mathrm{SO}_{3}$
(d) $\mathrm{HgSO}_{4}, \mathrm{H}_{2}$

Vishal Sharma

Numerade Educator

Problem 89

Which of the following is produced when conce trated cinnabar is roasted in the excess of air?
(a) $\mathrm{Hg}$
(b) $\mathrm{Fe}$
(c) $\mathrm{Zn}$
(d) $\mathrm{Al}$

Vishal Sharma

Numerade Educator

Problem 90

Which of the following statements is incorrect?
(a) lead is refined by electrolysis of PbSiF $_{6}$.
(b) red lead $\left(\mathrm{Pb}_{3} \mathrm{O}_{4}\right)$ is known as minium
(c) yellow lead oxide $(\mathrm{PbO})$ is known as massicot.
(d) none of these

Vishal Sharma

Numerade Educator

Problem 91

A metal gives two chlorides $\mathrm{A}$ and $\mathrm{B}$. A gives black precipitate with $\mathrm{NH}_{3}$ and $\mathrm{B}$ gives white. With $\mathrm{KI}, \mathrm{B}$ gives a yellow precipitate, which is soluble in excess of $\mathrm{KI} . \mathrm{A}$ and $\mathrm{B}$ are respectively
(a) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}, \mathrm{HgCl}_{2}$
(b) $\mathrm{HgCl}, \mathrm{Hg}_{2} \mathrm{Cl}_{2}$
(c) $\mathrm{ZnCl}_{2}, \mathrm{HgCl}_{2}$
(d) $\mathrm{HgCl}_{2}, \mathrm{ZnCl}^{2}$

Vishal Sharma

Numerade Educator

Problem 92

Mercuric sulphide dissolves in aqua regia to form
(a) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$
(b) $\mathrm{HgCl}_{2}$
(c) $\mathrm{Hg}\left(\mathrm{NO}_{3}\right) \mathrm{Cl}$
(d) $\mathrm{Hg}_{2}\left(\mathrm{NO}_{3}\right)_{2}$

Vishal Sharma

Numerade Educator

Problem 93

Which of the following is formed when mercurous nitrate reacts with $\mathrm{NaCl}$ ?
(a) $\mathrm{Hg}_{2} \mathrm{Cl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{Hg}\left(\mathrm{Na}_{2}\right) \mathrm{Cl}$
(c) $\mathrm{HgCl}_{2}$
(d) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$

Ramesh Singh

Numerade Educator

Problem 94

Which of the following acts as an antidote to $\mathrm{HgCl}_{2}$ poisoning?
(a) yellow of egg
(b) egg of fish
(c) white of egg
(d) egg

Vishal Sharma

Numerade Educator

Problem 95

Lead impurity is removed from silver by?
(a) distillation
(b) poling
(c) lavigation
(d) cupellation

Vishal Sharma

Numerade Educator

Problem 96

Iron is rendered passive by treatment with concentrated
(a) $\mathrm{HCl}$
(b) $\mathrm{HNO}_{3}$
(c) $\mathrm{H}_{3} \mathrm{PO}_{4}$
(d) $\mathrm{H}_{2} \mathrm{SO}_{4}$

Vishal Sharma

Numerade Educator

Problem 97

Which of the following is formed when mercurous nitrate reacts with $\mathrm{NaCl}$ ?
(a) $\mathrm{Hg}_{2} \mathrm{Cl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{Hg}\left(\mathrm{Na}_{2}\right) \mathrm{Cl}$
(c) $\mathrm{HgCl}_{2}$
(d) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$

Vishal Sharma

Numerade Educator

Problem 98

Which of the following statements are correct here?
(1) mercury (II) oxide is thermally unstable and readily decomposes into mercury and oxygen on being heated above $400^{\circ} \mathrm{C}$
(2) mercury (II) oxide is thermally stable even at high temperatures.
(3) mercury (II) sulphide is precipitated from $\mathrm{Hg}^{2+}$ solution by passing $\mathrm{H}_{2} \mathrm{~S}$ in the presence of high concentration of hydrogen ions.
(4) mercury forms two types of oxides: $\mathrm{HgO}$ and $\mathrm{Hg}_{2} \mathrm{O}$
(a) 1,2 and 3
(b) 1,3 and 4
(c) 2,3 and 4
(d) 2 and 4 only
Ferrous ion change to $\mathrm{X}$ ion

Ramesh Singh

Numerade Educator

Problem 99

Ferrous ion change to $\mathrm{X}$ ion, on reacting with acidified hydrogen peroxide. The number of d-electrons present in $X$ and its magnetic moment (in $\mathrm{BM})$ are respectively
(a) 5 and $4.9$
(b) 4 and $5.92$
(c) 6 and $6.95$
(d) 5 and $5.92$

Vishal Sharma

Numerade Educator

Problem 100

Ferrous ion change to $\mathrm{X}$ ion, on reacting with acidified hydrogen peroxide. The number of d-electrons present in $X$ and its magnetic moment (in $\mathrm{BM})$ are respectively
(a) 5 and $4.9$
(b) 4 and $5.92$
(c) 6 and $6.95$
(d) 5 and $5.92$

Ramesh Singh

Numerade Educator

Problem 101

Identify the compound $(\mathrm{X})$ and the condition (Y) her $\mathrm{PbS} \underset{\text { in air }}{\stackrel{\text { Heat }}{\longrightarrow}(\mathrm{X})+\mathrm{PbS}} \stackrel{(\mathrm{Y})}{\longrightarrow} \mathrm{Pb}+\mathrm{SO}_{2}$
(a) $\mathrm{X}=\mathrm{PbSO}_{3}, \mathrm{Y}=$ low temperature
(b) $\mathrm{X}=\mathrm{PbO}$ or $\mathrm{PbSO}_{4}, \mathrm{Y}=$ high temperature (air supply is cut off)
(c) $\mathrm{X}=\mathrm{Pb}_{3} \mathrm{O}_{4}, \mathrm{Y}=$ high temperature
(d) $\mathrm{X}=\mathrm{PbSO}_{4}, \mathrm{Y}=\mathrm{N}_{2}$

Vishal Sharma

Numerade Educator

Problem 102

vIn $\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{2-}$, the number of $\pi$ bonds is
(a) 2
(b) 3
(c) 4
(d) 6

Vishal Sharma

Numerade Educator

Problem 103

Silver chloride dissolves in excess of $\mathrm{NH}_{4} \mathrm{OH}$. The cation present in this solution is
(a) $\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{6}\right]^{+}$
(b) $\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{4}\right]^{+}$
(c) $\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}$
(d) $\mathrm{Ag}^{+}$

Vishal Sharma

Numerade Educator

Problem 104

$\mathrm{Fe}^{3+}$ can be detected by the reaction
(1) $\mathrm{Fe}^{3+}+\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{6}\right]^{4} \longrightarrow \mathrm{Fe}^{\mathrm{III}}\left[\mathrm{Fe}^{\mathrm{ll}}(\mathrm{CN})_{6}\right]$
Deep blue
(2) $\mathrm{Fe}^{3+}+\left[\mathrm{Fe}^{\mathrm{ll}}(\mathrm{CN})_{6}\right]^{3} \longrightarrow \mathrm{Fe}^{\mathrm{Il}}\left[\mathrm{Fe}^{\mathrm{III}}(\mathrm{CN})_{6}\right]$
(3) $\mathrm{Fe}^{3+}+\mathrm{SCN}^{-} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\mathrm{C}} \begin{gathered}\text { Brown } \\ {\left[\mathrm{Fe}(\mathrm{SCN})\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right]^{2^{+}}}\end{gathered}$
Blood red
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1,2 and 3
(d) 3 only

Ramesh Singh

Numerade Educator

Problem 105

In nitroprusside ion, iron and NO exist as $\mathrm{Fe}^{\mathrm{ll}}$ and NO $^{+}$rather than $\mathrm{Fe}^{\mathrm{III}}$ and NO. These forms can be differentiated by
(a) estimating the concentration of iron
(b) measuring the concentration of $\mathrm{CN}^{-}$
(c) measuring the solid state magnetic moment
(d) thermally decomposing the compound

Ramesh Singh

Numerade Educator

Problem 106

The chemical processes in the production of steel from haematite ore involve
(a) reduction
(b) oxidation
(c) reduction followed by oxidation
(d) oxidation followed by reduction

Vishal Sharma

Numerade Educator

Problem 107

In this reaction (C) and (D) are respectively, $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O} \stackrel{100^{\circ} \mathrm{C}}{\longrightarrow}(\mathrm{A}) \stackrel{230^{\circ} \mathrm{C}}{\longrightarrow}$
(B) $\stackrel{800^{\circ} \mathrm{C}}{\rightarrow}(\mathrm{C})+(\mathrm{D})$
(a) $\mathrm{Cu}_{2} \mathrm{O}, \mathrm{SO}_{2}$
(b) $\mathrm{CuO}, \mathrm{SO}_{3}$
(c) $\mathrm{CuO}, \mathrm{SO}_{2}$
(d) $\mathrm{Cu}_{2} \mathrm{O}, \mathrm{SO}_{3}$

Vishal Sharma

Numerade Educator

Problem 108

The chemical composition of 'slag' formed during the smelting process in the extraction of copper is
(a) $\mathrm{Cu}_{2} \mathrm{O}+\mathrm{FeS}$
(b) $\mathrm{FeSiO}_{3}$
(c) $\mathrm{CuFeS}_{2}$
(d) $\mathrm{Cu}_{2} \mathrm{~S}+\mathrm{FeO}$

Vishal Sharma

Numerade Educator

Problem 109

The chemical composition of 'slag' formed during the smelting process in the extraction of copper is
(a) $\mathrm{Cu}_{2} \mathrm{O}+\mathrm{FeS}$
(b) $\mathrm{FeSiO}_{3}$
(c) $\mathrm{CuFeS}_{2}$
(d) $\mathrm{Cu}_{2} \mathrm{~S}+\mathrm{FeO}$

Vishal Sharma

Numerade Educator

Problem 110

$\mathrm{SnO}$ can be prepared by
(1) boiling a stannous chloride solution with $\mathrm{Na}_{2} \mathrm{CO}_{3}$
(2) heating tin hydroxide in air
(3) heating tin oxalate $\left(\mathrm{SnC}_{2} \mathrm{O}_{4}\right)$ in absence of air
(a) 1 and 2
(b) 2 and 3
(c) 1,2 and 3
(d) 1 and 3

Ramesh Singh

Numerade Educator

Problem 111

The number of moles of $\mathrm{AgCl}$ precipitated when excess $\mathrm{AgNO}_{3}$ is added to one mole of $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl}$ is
(a) $3.0$
(b) $2.0$
(c) $1.0$
(d) zero

Vishal Sharma

Numerade Educator

Problem 111

The number of moles of $\mathrm{AgCl}$ precipitated when excess $\mathrm{AgNO}_{3}$ is added to one mole of $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl}$ is
(a) $3.0$
(b) $2.0$
(c) $1.0$
(d) zero

Narayan Hari

Numerade Educator

Problem 112

The number of moles of $\mathrm{AgCl}$ precipitated when excess $\mathrm{AgNO}_{3}$ is mixed with one mole of $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4}\right.$ $\left.\mathrm{Cl}_{2}\right] \mathrm{Cl}$ is
(a) 4
(b) 3
(c) 2
(d) 1

Vishal Sharma

Numerade Educator

Problem 112

The number of moles of $\mathrm{AgCl}$ precipitated when excess $\mathrm{AgNO}_{3}$ is mixed with one mole of $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4}\right.$ $\left.\mathrm{Cl}_{2}\right] \mathrm{Cl}$ is
(a) 4
(b) 3
(c) 2
(d) 1

Vishal Sharma

Numerade Educator

Problem 113

Which of the following compounds is expected to be coloured?
(a) $\mathrm{Ag}_{2} \mathrm{SO}_{4}$
(b) $\mathrm{CuF}_{2}$
(c) $\mathrm{MgF}_{2}$
(d) $\mathrm{CuCl}$

Vishal Sharma

Numerade Educator

Problem 114

When Zn metal is added to $\mathrm{CuSO}_{4}$ solution, $\mathrm{Cu}$ is precipitated it is due to
(a) ionization of $\mathrm{CuSO}_{4}$
(b) hydrolysis of $\mathrm{CuSO}_{4}$
(c) reduction of $\mathrm{Cu}^{2+}$
(d) oxidation of $\mathrm{Cu}^{2+}$

Vishal Sharma

Numerade Educator

Problem 115

In the following sequence of reactions. Identify (C) here? $\mathrm{FeCO}_{3} \stackrel{\text { Heat in air }}{\longrightarrow}(\mathrm{A}) \stackrel{\text { Boil with } \mathrm{HCl}}{\longrightarrow}(\mathrm{B}) \stackrel{\mathrm{K}_{\mathrm{F}} \mathrm{Fe}(\mathrm{CN})_{6}}{\longrightarrow}(\mathrm{C})$
(a) $\mathrm{K}_{3} \mathrm{Fe}(\mathrm{CN})_{6}$
(b) $\mathrm{Fe}(\mathrm{CNS})_{3}$
(c) $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$
(d) Both (b) and (c)

Vishal Sharma

Numerade Educator

Problem 116

v$\mathrm{CuSO}_{4}$ decolourize on addition of $\mathrm{KCN}$, the product is
(a) $\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}$
(b) $\mathrm{Cu}^{2+}$ gets reduced to form $\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}$
(c) $\mathrm{Cu}(\mathrm{CN})_{2}$
(d) $\mathrm{CuCN}$

Vishal Sharma

Numerade Educator

Problem 117

vFroth floatation process may be used to increase the concentration of the mineral in
(a) chalcopyrites
(b) bauxite
(c) haematite
(d) calamine

Vishal Sharma

Numerade Educator

Problem 118

The black compound formed during the reaction between sodium thiosulphate and silver nitrate is
(a) silver sulphite $\left(\mathrm{Ag}_{2} \mathrm{SO}_{3}\right)$
(b) silver sulphate $\left(\mathrm{Ag}_{2} \mathrm{SO}_{4}\right)$
(c) silver sulphide $\left(\mathrm{Ag}_{2} \mathrm{~S}\right)$
(d) silver thiosulphate $\left(\mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\right)$

Vishal Sharma

Numerade Educator

Problem 120

Amongst the following, the lowest degree of paramagnetism per mole of the compound at $298 \mathrm{~K}$ will be shown by
(a) $\mathrm{MnSO}_{4} \cdot 4 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}$
(c) $\mathrm{FeSO}_{4} .6 \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{NiSO}_{4} .6 \mathrm{H}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 121

Zn gives $\mathrm{H}_{2}$ gas with $\mathrm{H}_{2} \mathrm{SO}_{4}$ and $\mathrm{HCl}$, but not wit $\mathrm{HNO}_{3}$ because
(a) in electrochemical series, $\mathrm{Zn}$ is above hydrogen
(b) $\mathrm{NO}_{3}^{-}$ion is reduced in preference to hydroniur ion
(c) $\mathrm{Zn}$ acts as an oxidizing agent when reacts wit $\mathrm{HNO}_{3}$
(d) $\mathrm{HNO}_{3}$ is weaker acid than $\mathrm{H}_{2} \mathrm{SO}_{4}$ and $\mathrm{HCl}$

Vishal Sharma

Numerade Educator

Problem 122

Among the following statements, the incorrect one is
(a) calamine and siderite and carbonates
(b) argentite and cuprite are oxides
(c) zinc blende and pyrites are sulphides
(d) malachite and azurite are ores of copper

Vishal Sharma

Numerade Educator

Problem 123

Zinc-copper couple that can be used as a reducing agent is obtained by
(a) zinc coated with copper
(b) zinc and copper wires welded together
(c) mixing zinc dust and copper gauze
(d) copper coated with zinc

Vishal Sharma

Numerade Educator

Problem 124

Anhydrous ferric chloride is prepared by
(a) heating hydrated ferric chloride at a high temperature in a stream of air
(b) heating metallic iron in a stream of dry chlorine gas
(c) reaction of ferric oxide with hydrochloric acid
(d) reaction of metallic iron with hydrochloric acid

Vishal Sharma

Numerade Educator

Problem 125

Copper is extracted from copper pyrites ore by heating in a blast furnace. The method is based on the principle that
(a) copper has less affinity for oxygen than sulphur at high temperature
(b) sulphur has less affinity for oxygen at high temperature
(c) iron has less affinity for oxygen than sulphur at high temperature
(d) copper has more affinity for oxygen than sulphur at high temperature

Vishal Sharma

Numerade Educator

Problem 125

Mixture of $(\mathrm{X})=0.02$ moles of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}$
and $0.02$ mole of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}$ was prepared in 2 litre of solution
1 litre of mixture $(\mathrm{X})+$ excess $\mathrm{AgNO}_{3} \longrightarrow(\mathrm{Y})$
1 litre of mixture $(\mathrm{X})+$ excess $\mathrm{BaCl}_{2} \longrightarrow(\mathrm{Z})$
(a) $0.01,0.01$
(b) $0.02,0.01$
(c) $0.01,0.02$
(d) $0.02,0.02$

Ramesh Singh

Numerade Educator

Problem 126

Mixture of $(\mathrm{X})=0.02$ moles of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}$
and $0.02$ mole of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}$ was prepared in 2 litre of solution
1 litre of mixture $(\mathrm{X})+\mathrm{excess} \mathrm{AgNO}_{3} \longrightarrow(\mathrm{Y})$
1 litre of mixture $(\mathrm{X})+$ excess $\mathrm{BaCl}_{2} \longrightarrow(\mathrm{Z})$
(a) $0.01,0.01$
(b) $0.02,0.01$
(c) $0.01,0.02$
(d) $0.02,0.02$

Ramesh Singh

Numerade Educator

Problem 127

Identify the correct order of solubility of $\mathrm{Na}_{2} \mathrm{~S}, \mathrm{C}$ and $\mathrm{ZnS}$ is aqueous medium
(a) $\mathrm{CuS}>\mathrm{ZnS}>\mathrm{Na}_{2} \mathrm{~S}$
(b) $\mathrm{ZnS}>\mathrm{Na}_{2} \mathrm{~S}>\mathrm{CuS}$
(c) $\mathrm{Na}_{2} \mathrm{~S}>\mathrm{CuS}>\mathrm{ZnS}$
(d) $\mathrm{Na}_{2} \mathrm{~S}>\mathrm{ZnS}>\mathrm{CuS}$
For which of the following metals mav he hud.

Ramesh Singh

Numerade Educator

Problem 128

For which of the following metals may be hydrometallurgical extractive method be employed?
(a) copper
(b) iron
(c) chromium
(d) tin

Vishal Sharma

Numerade Educator

Problem 128

For which of the following metals may be hydrometallurgical extractive method be employed?
(a) copper
(b) iron
(c) chromium
(d) tin

Vishal Sharma

Numerade Educator

Problem 129

Pick out the incorrect statement among the following.
(1) ferric alum is commonly known as Mohr's salt
(2) cast iron cannot be welded
(3) heating steel to a high temperature followed by quick quenching in water is called annealing
(4) alnico is used for making utensils and automobile parts.
(a) $1,2,3$
(b) 1,3
(c) 2,4
(d) $1,3,4$

Vishal Sharma

Numerade Educator

Problem 130

Which of the following are the advantages of using oxygen in place of air in steel industry?
(1) it gives more pure product
(2) the surface is free from nitrides
(3) it makes the procedure faster, that is, more production
(4) larger quantities can also be handled
(a) 1,2 and 3
(b) 2 and 4 only
(c) 2,3 and 4
(d) $1,2,3$ and 4

Ramesh Singh

Numerade Educator

Problem 131

When dilute $\mathrm{HCl}$ is added to a solution of substance
(X) which is water soluble, a white precipitate $(\mathrm{Y})$ is formed. Treatment of $(\mathrm{Y})$ with $\mathrm{NH}_{4} \mathrm{OH}$ turns it black
(Z). Treatment of $(\mathrm{Y})$ with $\mathrm{H}_{2} \mathrm{~S}$ also turns it black. Identify $(X)$ here?
(a) $\mathrm{HgO}$
(b) $\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}$
(c) $\mathrm{HgSO}_{4}$
(d) $\mathrm{Hg}_{2}\left(\mathrm{NO}_{3}\right)_{2}$

Vishal Sharma

Numerade Educator

Problem 131

When dilute HCl is added to a solution of substance
(X) which is water soluble, a white precipitate (Y) is formed. Treatment of (Y) with $\mathrm{NH}_{4} \mathrm{OH}$ turns it black
(Z). Treatment of $(\mathrm{Y})$ with $\mathrm{H}_{2} \mathrm{~S}$ also turns it black. Identify (X) here?
(a) $\mathrm{HgO}$
(b) $\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}$
(c) $\mathrm{HgSO}_{4}$
(d) $\mathrm{Hg}_{2}\left(\mathrm{NO}_{3}\right)_{2}$

Vishal Sharma

Numerade Educator

Problem 132

A certain metal $\mathrm{A}$ is boiled in dilute nitric acid to give a salt B and an oxide of nitrogen $\mathrm{C}$. An aqueous solution of $\mathrm{B}$ with brine gives a precipitate $\mathrm{D}$ which is soluble in $\mathrm{NH}_{4} \mathrm{OH}$. On adding aqueous solution of $\mathrm{B}$ to hypo solution, a white precipitate $\mathrm{E}$ is obtained. $\mathrm{E}$ turns black on standing. Identify A and E here?
(a) $\mathrm{Zn}, \mathrm{Zn}_{2} \mathrm{SO}_{4}$
(b) $\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$
(c) $\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{Fe}, \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}$

Vishal Sharma

Numerade Educator

Problem 133

A certain metal $\mathrm{A}$ is boiled in dilute nitric acid to give a salt B and an oxide of nitrogen $\mathrm{C}$. An aqueous solution of $\mathrm{B}$ with brine gives a precipitate $\mathrm{D}$ which is soluble in $\mathrm{NH}_{4} \mathrm{OH}$. On adding aqueous solution of $\mathrm{B}$ to hypo solution, a white precipitate $\mathrm{E}$ is obtained. $\mathrm{E}$ turns black on standing. Identify A and E here?
(a) $\mathrm{Zn}, \mathrm{Zn}_{2} \mathrm{SO}_{4}$
(b) $\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$
(c) $\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{Fe}, \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}$

Vishal Sharma

Numerade Educator

Problem 134

Compound $\mathrm{X}$
(1) on strongly heating it gives two oxides of sulphur.
(2) on adding aqueous $\mathrm{NaOH}$ solution to its aqueous solution, a dirty green precipitate is obtained which starts turning brown on exposure to air. Identify X here.
(a) $\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{FeSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}$
(c) $\mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$

Vishal Sharma

Numerade Educator

Problem 135

A solution, when diluted with water and boiled, gives a white precipitate. On addition of excess $\mathrm{NH}_{4} \mathrm{Cl} /$ $\mathrm{NH}_{4} \mathrm{OH}$, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in $\mathrm{NH}_{4} \mathrm{OH} / \mathrm{NH}_{4} \mathrm{Cl}$
(a) $\mathrm{Zn}(\mathrm{OH})_{2}$
(b) $\mathrm{Al}(\mathrm{OH})_{3}$
(c) $\mathrm{Mg}(\mathrm{OH})$
(d) $\mathrm{Ca}(\mathrm{OH})$

Vishal Sharma

Numerade Educator

Problem 136

Two ores of the same metal $(\mathrm{M})$ are $\left(\mathrm{A}_{1}\right)$ and $\left(\mathrm{A}_{2}\right)$.
(1) $\mathrm{A}_{1} \stackrel{\text { calcination }}{\longrightarrow}$ Black residue $\mathrm{C}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$
(2) $\mathrm{A}_{1} \stackrel{\mathrm{HCl}, \mathrm{Kl}}{\longrightarrow} \mathrm{I}_{2}+\mathrm{D}$ precipitate
(3) $\mathrm{A}_{2} \stackrel{\text { roasting }}{\longrightarrow} \operatorname{Gas}(\mathrm{G})+\mathrm{Metal}(\mathrm{M})$
(4) $\mathrm{G} \stackrel{+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \text { acidified }}{\longrightarrow}$ Green solution
Identify $\mathrm{A}_{1}$ and $\mathrm{A}_{2}$ here?
(a) $\mathrm{A}_{1}=\mathrm{CuCO}_{3} \cdot \mathrm{Cu}(\mathrm{OH})_{2}, \mathrm{~A}_{2}=\mathrm{Cu}_{2} \mathrm{~S}$

Ramesh Singh

Numerade Educator

Problem 137

Which compound is formed when excess of $\mathrm{KCN}$ is added to an aqueous solution of copper sulphate?
(a) $\mathrm{Cu}(\mathrm{CN})_{2}$
(b) $\mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{6}\right]$
(c) $\mathrm{K}\left[\mathrm{Cu}(\mathrm{CN})_{2}\right]$
(d) $\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]$

Vishal Sharma

Numerade Educator

Problem 138

A is a coloured crystalline solid which is easily soluble in water. Addition of aqueous KCN gives a precipitate which dissolves in excess of reagent whereas addition of KI aqueous solution gives a white grey precipitate with the liberation of iodine. On gently heating, A loses $80 \%$ of its water of crystallization. Identify A here?
(a) $\mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{FeSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}$
(c) $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$

Ramesh Singh

Numerade Educator

Problem 139

Which of the following alloys contain $\mathrm{Cu}$ and $\mathrm{Zn} ?$
1. bronze
2. brass
3. gun metal
4. type metal
(a) $2,3,4$
(b) $1,2,3$
(c) 12
(d) all

Vishal Sharma

Numerade Educator

Problem 140

A white, water insoluble solid A turns yellow on heating and becomes white on cooling. A gives a clear solution B when treated with dilute $\mathrm{HCl}$ or $\mathrm{NaOH}$. When $\mathrm{H}_{2} \mathrm{~S}$ is passed through solution $\mathrm{B}$, and made neutral, a white precipitate $\mathrm{C}$ is formed. Identify A?
(a) $\mathrm{ZnO}$
(b) $\mathrm{CuO}$
(c) $\mathrm{Fe}_{2} \mathrm{O}_{3}$
(d) $\mathrm{Ag}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 141

Match the following:
List-I List-II
1. Bell metal
(i) Cu: $60 \%-80 \%, \mathrm{Zn}: 20 \%-40 \%$
2. Gun metal
(ii) $\mathrm{Cu}: 75 \%-90 \%, \mathrm{Sn}: 10 \%-25 \%$
3. Bronze
(iii) $\mathrm{Cu}: 88 \%, \mathrm{Sn}: 10 \%, \mathrm{Zn}: 2 \%$
4. Brass
(iv) Cu: 80\% Sn: $20 \%$ The correct matching is:
1
2
3
4
(a)
(iv)
(iii)
(ii)
(i)
(b)
(iii)
(iv)
(ii)
(i)
(c)
(iv)
(ii)
(i)
(iii)
(d)
(iii)
(iv)
(i)
(ii)

Vishal Sharma

Numerade Educator

Problem 142

Which of the following statement is correct with reference to the ferrous and ferric ions?
1. $\mathrm{Fe}^{3+}$ gives brown colour with potassium ferricyanide
2. $\mathrm{Fe}^{2+}$ gives blue precipitate with potassium ferricyanide
3. $\mathrm{Fe}^{3+}$ gives red colour with potassium thiocyanate
4. $\mathrm{Fe}^{2+}$ gives brown colour with ammonium thiocyanate.
(a) 1,4
(b) 1,2
(c) 2,3
(d) all of these

Ramesh Singh

Numerade Educator

Problem 143

A colourless water soluble salt $X$ on heating gives brown gas and leaves a metallic residue. Solution of $X$ gives brick red precipitate with solution of $\mathrm{K}_{2} \mathrm{CrO}_{4}$. An ammonical solution of $X$ gives a silver mirror with formic acid. Salt $X$ is used in making indelible election ink. Identify the salt $X$ here?
(a) $\mathrm{AgCl}$
(b) $\mathrm{HgNO}_{3}$
(c) $\mathrm{AgNO}_{3}$
(d) $\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}$

Vishal Sharma

Numerade Educator

Problem 144

Match the following:
List-I List-II
1. Nichrome
(i) $\mathrm{Pb}, \mathrm{Bi}, \mathrm{Sn}, \mathrm{Cd}$
2. Type metal
(ii) $\mathrm{Pb}, \mathrm{Sb}, \mathrm{Sn}$
3. Wood's metal
(iii) $\mathrm{Cu}, \mathrm{Al}, \mathrm{Zn}$
4. Devarda's alloy
(iv) $\mathrm{Fe}, \mathrm{Ni}, \mathrm{Cr}$The correct matching is 1
2
3
(a) (ii)
(i)
(iii) (iv)
(b) (iii)
(iv) (ii) (i)
(c) (iv)
(ii) (i)
(iii)
(d) (iii)
(iv) (i)
(ii)

Vishal Sharma

Numerade Educator

Problem 145

In the process of extraction of gold roasted gold ore $+\mathrm{CN}^{-}+\mathrm{H}_{2} \mathrm{O} \stackrel{\mathrm{O}_{2} \rightarrow}[\mathrm{X}]+\mathrm{OH}^{-}$
$[\mathrm{X}]+\mathrm{Zn} \longrightarrow[\mathrm{Y}]+\mathrm{Au}$
$[\mathrm{X}]$ and $[\mathrm{Y}]$ are
(a) $[\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{-2}$
(b) $[\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{-3},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{-2}$
(c) $[\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{-4}$
(d) $[\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{-},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{-2}$

Vishal Sharma

Numerade Educator

Problem 146

Which of the following elements occur as their chlorides in earth crust ?
(a) $\mathrm{Na}$
(b) $\mathrm{Cu}$
(c) $\mathrm{Ag}$
(d) $\mathrm{K}$

Vishal Sharma

Numerade Educator

Problem 148

Roasting of copper pyrites is done
(a) To oxidize free sulphur
(b) Ro remove moisture
(c) To remove volatile organic impurities
(d) To decompose sulphides into oxides.

Vishal Sharma

Numerade Educator

Problem 149

Which of the following statements is/are correct for electrolytic refining?
(a) The electric current used is $\mathrm{AC}$
(b) On account of electrolysis, the metal is indirectly transferred from anode to cathode
(c) The impurity metal is made the anode while a thin sheet of pure metal is used as the cathode
(d) The electrolyte used is a covalent compound of metal

Vishal Sharma

Numerade Educator

Problem 150

vSilver is a soft metal. It is hardened by alloying it wi small amounts of
(a) $\mathrm{Cu}$
(b) $\mathrm{Fe}$
(c) $\mathrm{Ni}$
(d) $\mathrm{Sn}$

Ramesh Singh

Numerade Educator

Problem 150

Silver is a soft metal. It is hardened by alloying it with small amounts of
(a) $\mathrm{Cu}$
(b) $\mathrm{Fe}$
(c) $\mathrm{Ni}$
(d) $\mathrm{Sn}$

Ramesh Singh

Numerade Educator

Problem 150

Silver is a soft metal. It is hardened by alloying it with small amounts of
(a) $\mathrm{Cu}$
(b) $\overline{\mathrm{Fe}}$
(c) $\mathrm{Ni}$
(d) $\mathrm{Sn}$

Ramesh Singh

Numerade Educator

Problem 151

Which of the following are correctly matched?
(a) Zone refining - Ultra pure Ge
(b) Leaching - Extraction of $\mathrm{Au}, \mathrm{Ag}$
(c) Cyanide process - Extraction of Au
(d) Electrolyte reduction - Extraction of Al

Vishal Sharma

Numerade Educator

Problem 152

In which of the following pair (s), the minerals are converted into metals by self reduction ?
(a) $\mathrm{Cu}_{2} \mathrm{~S}, \mathrm{HgS}$
(b) $\mathrm{Ag}_{2} \mathrm{~S}, \mathrm{ZnS}$
(c) $\mathrm{PbS}, \mathrm{ZnS}$
(d) $\mathrm{Cu}, \mathrm{S}, \mathrm{PbS}$

Vishal Sharma

Numerade Educator

Problem 153

Which of the following is/are oxide ore (s)?
(a) Bauxite
(b) Cassiterite
(c) Haematite
(d) Cryolite

Vishal Sharma

Numerade Educator

Problem 153

Which of the following is/are oxide ore (s)?
(a) Bauxite
(b) Cassiterite
(c) Haematite
(d) Cryolite

Vishal Sharma

Numerade Educator

Problem 154

The following methods are not advisable to extract zinc from its oxide ore.
(a) Reduction with aluminium
(b) Reduction with $\mathrm{H}_{2}$
(c) Electrolytic reduction
(d) Reduction with carbon

Vishal Sharma

Numerade Educator

Problem 155

In the process of extraction of gold
Roasted gold ore $+\mathrm{CN}^{-}+\mathrm{H}_{2} \mathrm{O} \stackrel{\mathrm{O}_{2}}{\longrightarrow}[\mathrm{X}]+\mathrm{OH}^{-}$
$[\mathrm{X}]+\mathrm{Zn} \longrightarrow[\mathrm{Y}]+\mathrm{Au}$
Identify the complexes of $[\mathrm{X}]$ and $[\mathrm{Y}]$
(a) $\mathrm{Y}=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}$
(b) $\mathrm{X}=\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{3-}$
(c) $\mathrm{X}=\left[\mathrm{Au}(\mathrm{CN})_{2}\right]$
(d) $\mathrm{Y}=\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{4-}$

Vishal Sharma

Numerade Educator

Problem 156

The method of thermal decomposition cannot be used for
(a) $\mathrm{Au}$
(b) $\mathrm{Hg}$
(c) $\mathrm{Mg}$

Ramesh Singh

Numerade Educator

Problem 157

Below $710^{\circ} \mathrm{C}$, the best reducing agent is
(a) Carbonmonoxide that gets oxidized to $\mathrm{CO}_{2}$
(b) Carbon that gets oxidized to $\mathrm{C}_{3} \mathrm{O}_{2}$.
(c) Carbon that gets oxidized to $\mathrm{CO}_{2}$.
(d) Carbon that gets oxidized to $\mathrm{CO}$

Vishal Sharma

Numerade Educator

Problem 158

Match the following
\begin{tabular}{ll}
\hline Column-I & Column-II \\
\hline $\begin{array}{ll}\text { (a) } \mathrm{Ag} & \text { (p) Froth flotation } \\
\text { (b) } \mathrm{Cu} & \text { (q) Electrorefining } \\
\text { (c) } \mathrm{Zr} & \text { (r) Van Arkel process } \\
\text { (d) } \mathrm{Ni} & \text { (s) Mond's process } \\
& \text { (t) Hydrometallurgy }\end{array}$ \\
\hline
\end{tabular}

Vishal Sharma

Numerade Educator

Problem 159

Match the following
2 2 0 2 Column-II [ Column-I
(a) $\mathrm{Al}$
(b) $\mathrm{Cu}$ (p) Calamine 1 0
(q) Cryolite(c) $\mathrm{Mg}$
(r) Malachite
(d) $\mathrm{Zn}$
(s) Carnallite

Vishal Sharma

Numerade Educator

Problem 160

Match the following
\begin{tabular}{ll}
\hline Column-I & Column-II \\
\hline (a) Asbestos & (p) Calcium \\
(b) Willemite & (q) Lead \\
(c) Anglesite & (r) Silicate \\
(d) Diaspore & (s) Aluminium \\
& (t) Sulphate \\
\hline
\end{tabular}

Vishal Sharma

Numerade Educator

Problem 161

The number of sulphide minerals of the following is
Cuprite, Argentite, Carnallite, Magnesite, Galena, Black Jack.

Vishal Sharma

Numerade Educator

Problem 162

Among the metals, Ti, V, W, Zr, Th and Au, the no. of metals purified by van Arkel method is

Vishal Sharma

Numerade Educator

Problem 163

\text { Among the following minerals, siderite, malachite, }cerussite, anglessite, smithsonite, diaspore, mica and corundum, the number of carbonate minerals is

Vishal Sharma

Numerade Educator

Problem 164

Consider the following reactions occurring during metallurgical processes. $2 \mathrm{ZnS}+3 \mathrm{O}_{2} \longrightarrow 2 \mathrm{ZnO}+2 \mathrm{SO}_{2}$
$\mathrm{ZnS}+2 \mathrm{O}_{2} \longrightarrow \mathrm{ZnSO}_{4}$\begin{aligned}
&\mathrm{CaCO}_{3} \longrightarrow \mathrm{CaO}+\mathrm{CO}_{2} \\
&\mathrm{Al}_{2} \mathrm{O}_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{H}_{2} \mathrm{O} \\
&3 \mathrm{Mn}_{3} \mathrm{O}_{4}+8 \mathrm{Al} \longrightarrow 4 \mathrm{Al}_{2} \mathrm{O}_{3}+9 \mathrm{Mn}
\end{aligned}The number of reactions occurring during the process of calcinations is

Vishal Sharma

Numerade Educator

Problem 165

Among $\mathrm{Zn}, \mathrm{Cd}, \mathrm{Cu}, \mathrm{Sn}, \mathrm{Ge}, \mathrm{Pb}, \mathrm{Au}$ and $\mathrm{Bi}$, no. of
netals refined by liquation is

Vishal Sharma

Numerade Educator

Problem 166

When the sample of copper with zinc impurity is to be purified by electrolysis the appropriate electrodes are [2002] Cathode $\quad$ Anode
(a) pure zinc $\quad$ pure copper
(b) pure copper impure sample
(c) impure zinc impure sample
(d) impure sample pure copper

Vishal Sharma

Numerade Educator

Problem 167

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be [2003]
(a) mercury
(b) tin
(c) sodium
(d) magnesium

Ramesh Singh

Numerade Educator

Problem 167

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be [2003]
(a) mercury
(b) tin
(c) sodium
(d) magnesium

Ramesh Singh

Numerade Educator

Problem 168

Which one of the following nitrates will leave behind a metal on strong heating? [2003]
(a) ferric nitrate
(b) copper nitrate
(c) manganese nitrate
(d) silver nitrate

Vishal Sharma

Numerade Educator

Problem 169

Which one of the following ores is best concentrated by froth-floatation method?
(a) cassiterite
(b) galena
(c) malachite
(d) magnetite

Vishal Sharma

Numerade Educator

Problem 170

Excess of KI react with $\mathrm{CuSO}_{4}$ solution and then $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ solution is added to it. Which of the following statements is incorrect for this reaction? [2004]
(a) $\mathrm{Cu}_{2} \mathrm{I}_{2}$ is formed
(b) $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ is oxidized
(c) $\mathrm{CuI}$, is formed
(d) Evolved $\mathrm{I}_{2}$ is reduced

Vishal Sharma

Numerade Educator

Problem 171

Among the properties (A) reducing (B) oxidizing (C) complexing, the set of properties shown by $\mathrm{CN}$ - ion towards metal species is [2004]
(a) A, B
(b) $\mathrm{B}, \mathrm{C}$
(c) $\mathrm{C}, \mathrm{A}$
(d) $\mathrm{A}, \mathrm{B}, \mathrm{C}$

Ramesh Singh

Numerade Educator

Problem 172

During the process of electrolytic refining of copper some metals present as impurity settle as anode mud. These are $\quad[\mathbf{2 0 0 5}]$
(a) $\mathrm{Ag}$ and $\mathrm{Au}$
(b) $\mathrm{Pb}$ and $\mathrm{Zn}$
(c) $\mathrm{Fe}$ and $\mathrm{Ni}$
(d) $\mathrm{Sn}$ and $\mathrm{A} \mathrm{g}$

Vishal Sharma

Numerade Educator

Problem 173

Heating mixture of $\mathrm{Cu}_{2} \mathrm{O}$ and $\mathrm{Cu}_{2} \mathrm{~S}$ will give
(a) $\mathrm{Cu}+\mathrm{SO}_{2}$
(b) $\mathrm{Cu}+\mathrm{SO}_{3}$
(c) $\mathrm{CuO}+\mathrm{CuS}$
(d) $\mathrm{Cu}_{2} \mathrm{SO}_{3}$

Narayan Hari

Numerade Educator

Problem 174

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly? [2008]
(a) Metal sulphides are thermodynamically more stable than $\mathrm{CS}_{2}$
(b) $\mathrm{CO}_{2}$ is thermodynamically more stable than $\mathrm{CS}_{2}$
(c) Metal sulphides are less stable than the corresponding oxides
(d) $\mathrm{CO}_{2}$ is more volatile than $\mathrm{CS}_{2}$.

CC

Charvi Charvi

Numerade Educator

Problem 175

Which method of purification is represented by the following equation:
$(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g}) \stackrel{523 \mathrm{~K}}{\longrightarrow} \mathrm{Ti} \mathrm{I}_{4}(\mathrm{~g}) \stackrel{120 \mathrm{~K}}{\longrightarrow} \mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g})$
[2012]
(a) Poling
(b) Cupellation
(c) Zone refining
(d) Van Arkel

Vishal Sharma

Numerade Educator

Problem 176

Iron exhibits $+2$ and $+3$ oxidation states. Which of the following statements about iron is incorrect? [2012]
(a) Ferrous compounds are less volatile than the corresponding ferric compounds
(b) Ferrous compounds are relatively more ionic than the corresponding ferric compounds.
(c) Ferrous oxide is more basic in nature than the ferric oxide
(d) Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds

Vishal Sharma

Numerade Educator

Problem 177

Which series of reactions correctly represents chemical relations related to iron and its compound? $[2014]$
(a) $\mathrm{Fe} \stackrel{\mathrm{C}_{2} \text { heat }}{\longrightarrow} \mathrm{FeCl}_{3} \stackrel{\text { het air }}{\longrightarrow}$
$\mathrm{FeCl}_{2} \stackrel{\mathrm{Zn}}{\longrightarrow} \mathrm{Fe}$
(b) $\mathrm{Fe} \stackrel{\mathrm{O}_{3} \mathrm{haat}}{\longrightarrow} \mathrm{FeCl}_{3} \stackrel{\mathrm{CO}, 600^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{FeO}$
$\stackrel{\cos w^{2} \mathrm{C}}{\longrightarrow} \mathrm{Fe}$c) $\mathrm{Fe} \stackrel{\mathrm{d} \mathrm{H}_{\mathrm{H}} \mathrm{SO}_{4}}{\longrightarrow} \mathrm{FeSO}_{4} \stackrel{\mathrm{H}, \mathrm{So}_{4}, \mathrm{O}_{3}}{\longrightarrow}$
$\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{2} \stackrel{\text { Heat }}{\longrightarrow} \mathrm{Fe}$
d) $\mathrm{Fe} \stackrel{\mathrm{O}_{\mathrm{b} \mathrm{ben}}}{\longrightarrow} \mathrm{FeSO}_{4} \stackrel{\mathrm{diH}_{2} \mathrm{So}_{4}}{\longrightarrow}$
$\mathrm{FeSO}_{4} \stackrel{\text { Heart }}{\longrightarrow} \mathrm{Fe}$

Vishal Sharma

Numerade Educator

Problem 178

In the context of the Hall-Heroult process for the extraction of $\mathrm{Al}$, which of the following statement is false?
(a) $\mathrm{CO}$ and $\mathrm{CO}_{2}$ are produced in this process
(b) $\mathrm{Al}_{2} O_{3}$ is mixed with $\mathrm{CaF}_{2}$ which lowers the melting point of the mixture and brings conductivity

Vishal Sharma

Numerade Educator

Problem 179

Which of the following are is best concentrated by froth floatation method?
a) Siderite
(b) Galena
c) Malachite
(d) magnetite

Vishal Sharma

Numerade Educator

Problem 180

Galvanization is applying a coating of? [2016]
(a) $\mathrm{Cu}$
(b) $\mathrm{Zn}$
(c) $\overline{\mathrm{Cr}}$
(d) $\mathrm{Pb}$

Vishal Sharma

Numerade Educator