43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry

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Chapter 22

The d-and f-Block Elements - all with Video Answers

Educators

Section 1

Topic 1 : d-Block Elements

Problem 1

The incorrect statement(s) among (1) - (3) is (are) :
(1) W(VI) is more stable than $\mathrm{Cr}(\mathrm{VI})$.
(2) in the presence of $\mathrm{HCl}$, permanganate titrations provide satisfactory results.
(3) some lanthanoid oxides can be used as phosophorus.
(a) (2) and (3) only
(b) (1) and (2) only
(c) (2) only
(d) (1) only

Narayan Hari

Narayan Hari

Numerade Educator

Problem 2

The incorrect statement is :
(a) Manganate and permanganate ions are tetrahedral
(b) In manganate and permanganate ions, the $\pi$-bonding takes place by overlap of $p$-orbitals of oxygen and $d$-orbitals of manganese
(c) Manganate and permanganate ions are paramagnetic
(d) Manganate ion is green in colour and permanganate ion is purple in colour

Narayan Hari

Numerade Educator

Problem 3

The third ionization enthalpy is minimum for:
(a) $\mathrm{Co}$
(b) $\mathrm{Fe}$
(c) Ni
(d) $\mathrm{Mn}$

Narayan Hari

Numerade Educator

Problem 4

The atomic radius of $\mathrm{Ag}$ is closest to:
(a) $\mathrm{Au}$
(b) $\mathrm{Ni}$
(c) $\mathrm{Cu}$
(d) $\mathrm{Hg}$

Narayan Hari

Numerade Educator

Problem 5

Thermal decomposition of a Mn compound (X) at $513 \mathrm{~K}$ results in compound $\mathrm{Y}, \mathrm{MnO}_{2}$ and a gaseous product. $\mathrm{MnO}_{2}$ reacts with $\mathrm{NaCl}$ and concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to give a pungent gas $\mathrm{Z} . \mathrm{X}, \mathrm{Y}$, and $\mathrm{Z}$, respectively, are:
(a) $\mathrm{KMnO}_{4}, \mathrm{~K}_{2} \mathrm{MnO}_{4}$ and $\mathrm{Cl}_{2}$
(b) $\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{KMnO}_{4}$ and $\mathrm{SO}_{2}$
(c) $\mathrm{K}_{3} \mathrm{MnO}_{4}, \mathrm{~K}_{2} \mathrm{MnO}_{4}$ and $\mathrm{Cl}_{2}$
(d) $\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{KMnO}_{4}$ and $\mathrm{Cl}_{2}$

Narayan Hari

Numerade Educator

Problem 6

Consider the hydrated ions of $\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Ti}^{3+}$, and $\mathrm{Sc}^{3+}$. The correct order of their spin-only magnetic moments is:
(a) $\mathrm{V}^{2+}<\mathrm{Ti}^{2+}<\mathrm{Ti}^{3+}<\mathrm{Sc}^{3+}$
(b) $\mathrm{Sc}^{3+}<\mathrm{Ti}^{3+}<\mathrm{Ti}^{2+}<\mathrm{V}^{2+}$
(c) $\mathrm{Ti}^{3+}<\mathrm{Ti}^{2+}<\mathrm{Sc}^{3+}<\mathrm{V}^{2+}$
(d) $\mathrm{Sc}^{3+}<\mathrm{Ti}^{3+}<\mathrm{V}^{2+}<\mathrm{Ti}^{2+}$

Narayan Hari

Numerade Educator

Problem 7

The INCORRECT statement is :
(a) the gemstone, ruby, has $\mathrm{Cr}^{3+}$ ions occupying the octahedral sites of beryl.
(b) the spin-only magnetic moment of $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]^{2+}$ is $2.83 \mathrm{BM}$.
(c) the color of $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$ is violet as it absorbs the yellow light.
(d) the spin-only magnetic moments of $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ are
nearly similar.

Narayan Hari

Numerade Educator

Problem 8

The statement that is INCORRECT about the interstitial compounds is :
(a) they are chemically reactive.
(b) they are very hard.
(c) they have metallic conductivity.
(d) they have high melting points.

Narayan Hari

Numerade Educator

Problem 9

The element that usually does NOT show variable oxidation states is:
(a) $\mathrm{Cu}$
(b) Ti
(c) $\mathrm{Sc}$
(d) V

Narayan Hari

Numerade Educator

Problem 10

$\mathrm{A} \stackrel{4 \mathrm{KOH}, \mathrm{O}_{2}}{\longrightarrow} \underset{(\mathrm{Green})}{2 \mathrm{~B}}+2 \mathrm{H}_{2} \mathrm{O}$
$\mathrm{B} \stackrel{4 \mathrm{HCl}}{\longrightarrow} \underset{(\text { Purple })}{2 \mathrm{C}}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
$2 \mathrm{C} \stackrel{\mathrm{H}_{2} \mathrm{O}, \mathrm{KI}}{\longrightarrow} 2 \mathrm{~A}+\mathrm{KOH}+\mathrm{D}$
In the above sequence of reactions, A and D, respectively, are:
(a) $\mathrm{KI}$ and $\mathrm{KMnO}_{4}$
(b) $\mathrm{MnO}_{2}$ and $\mathrm{KIO}_{3}$
(c) $\mathrm{KIO}_{3}$ and $\mathrm{MnO}_{2}$
(d) $\mathrm{KI}$ and $\mathrm{K}_{2} \mathrm{MnO}_{4}$

Narayan Hari

Numerade Educator

Problem 11

The transition element that has lowest enthalpy of atomisation is:
(a) $\mathrm{Fe}$
(b) $\mathrm{Cu}$
(c) V
(d) $\mathrm{Zn}$

Narayan Hari

Numerade Educator

Problem 12

When $\mathrm{XO}_{2}$ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as $\mathrm{KNO}_{3}$, a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is:
(a) $\mathrm{Mn}$
(b) $\mathrm{Cr}$
(c) V
(d) $\mathrm{Ti}$

Narayan Hari

Numerade Educator

Problem 13

In the following reactions, $\mathrm{ZnO}$ is respectively acting as a/an:
(i) $\mathrm{ZnO}+\mathrm{Na}_{2} \mathrm{O} \rightarrow \mathrm{Na}_{2} \mathrm{ZnO}_{2}$
(ii) $\mathrm{ZnO}+\mathrm{CO}_{2} \rightarrow \mathrm{ZnCO}_{3}$
(a) base and acid
(b) base and base
(c) acid and acid
(d) acid and base

Narayan Hari

Numerade Educator

Problem 14

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
(a) $\mathrm{Ti}^{2+}$
(b) $\mathrm{V}^{2+}$
(c) $\mathrm{Cr}^{2+}$
(d) $\mathrm{Mn}^{2+}$

Narayan Hari

Numerade Educator

Problem 15

Which of the following combination will produce $\mathrm{H}_{2}$ gas?
(a) Fe metal and conc. $\mathrm{HNO}_{3}$
(b) Cu metal and conc. $\mathrm{HNO}_{3}$
(c) $\mathrm{Zn}$ metal and $\mathrm{NaOH}(\mathrm{aq})$
(d) Au metal and $\mathrm{NaCN}(\mathrm{aq})$ in the presence of air

Narayan Hari

Numerade Educator

Problem 16

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:
(a) $\mathrm{NO}$ and $\mathrm{N}_{2} \mathrm{O}$
(b) $\mathrm{NO}_{2}$ and $\mathrm{N}_{2} \mathrm{O}$
(c) $\mathrm{N}_{2} \mathrm{O}$ and $\mathrm{NO}_{2}$
(d) $\mathrm{NO}_{2}$ and $\mathrm{NO}$

Narayan Hari

Numerade Educator

Problem 17

Which of the following compounds is metallic and ferromagnetic?
(a) $\mathrm{VO}_{2}$
(b) $\mathrm{MnO}_{2}$
(c) $\mathrm{TiO}_{2}$
(d) $\mathrm{CrO}_{2}$

Narayan Hari

Numerade Educator

Problem 18

The transition metal ions responsible for colour in ruby and emerald are, respectively:
(a) $\mathrm{Co}^{3+}$ and $\mathrm{Cr}^{3+}$
(b) $\mathrm{Co}^{3+}$ and $\mathrm{Co}^{3+}$
(c) $\mathrm{Cr}^{3+}$ and $\mathrm{Cr}^{3+}$
(d) $\mathrm{Cr}^{3+}$ and $\mathrm{Co}^{3+}$

Narayan Hari

Numerade Educator

Problem 19

When concentrated $\mathrm{HCl}$ is added to an aqueous solution of $\mathrm{CoCl}_{2}$, its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction?
(a) $\left[\mathrm{CoCl}_{4}\right]^{2-}$
(b) $\left[\mathrm{CoCl}_{6}\right]^{3-}$
(c) $\left[\mathrm{CoCl}_{6}\right]^{4-}$
(d) $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

Narayan Hari

Numerade Educator

Problem 20

The equation which is balanced and represents the correct product(s) is:
(a) $\mathrm{Li}_{2} \mathrm{O}+2 \mathrm{KCl} \longrightarrow 2 \mathrm{LiCl}+\mathrm{K}_{2} \mathrm{O}$
(b) $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{+}+5 \mathrm{H}^{+} \longrightarrow \mathrm{Co}^{2+}+5 \mathrm{NH}_{4}^{+}+\mathrm{Cl}^{-}$
(c) $\left[\mathrm{Mg}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}+(\mathrm{EDTA})^{4-}$
$\stackrel{\text { excess } \mathrm{NaOH}}{\longrightarrow}[\mathrm{Mg}(\mathrm{EDTA})]^{2+}+6 \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{CuSO}_{4}+4 \mathrm{KCN} \longrightarrow \mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]+\mathrm{K}_{2} \mathrm{SO}_{4}$

Narayan Hari

Numerade Educator

Problem 21

Which series of reactions correctly represents chemical reactions related to iron and its compound?
(a) $\mathrm{Fe} \stackrel{\mathrm{dil} \cdot \mathrm{H}_{2} \mathrm{SO}_{4}}{\longrightarrow} \mathrm{FeSO}_{4} \stackrel{\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{O}_{2}}{\longrightarrow}$
$\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}$
(b) $\mathrm{Fe} \stackrel{\mathrm{O}_{2}, \text { heat }}{\longrightarrow} \mathrm{FeO} \stackrel{\text { dil. } \mathrm{H}_{2} \mathrm{SO}_{4}}{\longrightarrow}$
$\mathrm{FeSO}_{4} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}$
(c) $\mathrm{Fe} \stackrel{\mathrm{Cl}_{2}, \text { heat }}{\longrightarrow} \mathrm{FeCl}_{3} \stackrel{\text { heat, air }}{\longrightarrow} \mathrm{FeCl}_{2} \stackrel{\mathrm{Zn}}{\longrightarrow} \mathrm{Fe}$
(d) $\mathrm{Fe} \stackrel{\mathrm{O}_{2} \text {, heat }}{\longrightarrow} \mathrm{Fe}_{3} \mathrm{O}_{4} \stackrel{\mathrm{CO}, 600^{\circ} \mathrm{C}}{\longrightarrow}$
$\mathrm{FeO} \stackrel{\mathrm{CO}, 700^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{Fe}$

Narayan Hari

Numerade Educator

Problem 22

Which one of the following exhibits the large number of oxidation states?
(a) Ti (22)
(b) V (23)
(c) $\operatorname{Cr}(24)$
(d) $\operatorname{Mn}(25)$

Narayan Hari

Numerade Educator

Problem 23

Which of the following is not formed when $\mathrm{H}_{2} \mathrm{~S}$ reacts with acidic $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution?
(a) $\mathrm{CrSO}_{4}$
(b) $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
(c) $\mathrm{K}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{S}$

Narayan Hari

Numerade Educator

Problem 24

Which of the following arrangements does not represent the correct order of the property stated against it ?
(a) $\mathrm{V}^{2+}<\mathrm{Cr}^{2+}<\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}:$ paramagnetic behaviour
(b) $\mathrm{Ni}^{2+}<\mathrm{Co}^{2+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$ : ionic size
(c) $\mathrm{Co}^{3+}<\mathrm{Fe}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Sc}^{3+}:$ stability in aqueous solution
(d) $\mathrm{Sc}<\mathrm{Ti}<\mathrm{Cr}<\mathrm{Mn}$ : number of oxidation states

Narayan Hari

Numerade Educator

Problem 25

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $\mathrm{E}_{\mathrm{M}}^{\circ} 3+\mathrm{M}^{2+}$ value ?
(a) $\operatorname{Cr}(\mathrm{Z}=24)$
(b) $\operatorname{Mn}(Z=25)$
(c) $\mathrm{Fe}(\mathrm{Z}=26)$
(d) $\operatorname{Co}(\mathrm{Z}=27)$

Narayan Hari

Numerade Educator

Problem 26

When a small amount of $\mathrm{KMnO}_{4}$ is added to concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$, a green oily compound is obtained which is highly explosive in nature. Compound may be :
(a) $\mathrm{MnSO}_{4}$
(b) $\mathrm{Mn}_{2} \mathrm{O}_{7}$
(c) $\mathrm{MnO}_{2}$
(d) $\mathrm{Mn}_{2} \mathrm{O}_{3}$

Narayan Hari

Numerade Educator

Problem 27

The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds:
(a) $3 d^{5} 4 s^{2}$
(b) $3 d^{8} 4 s^{2}$
(c) $3 d^{7} 4 s^{2}$
(d) $3 d^{6} 4 s^{2}$

Narayan Hari

Numerade Educator

Problem 28

The colour of light absorbed by an aqueous solution of $\mathrm{CuSO}_{4}$ is:
(a) orange-red
(b) blue-green
(c) yellow
(d) violet

Narayan Hari

Numerade Educator

Problem 29

Among the following, the coloured compound is
(a) $\mathrm{CuCl}$
(b) $\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]$
(c) $\mathrm{CuF}_{2}$
(d) $\left[\mathrm{Cu}\left(\mathrm{CH}_{3} \mathrm{CN}\right)_{4}\right] \mathrm{BF}_{4}$

Alkendra Singh

Numerade Educator

Problem 30

Native silver metal forms a water soluble complex with a dilute aqueous solution of $\mathrm{NaCN}$ in the presence of(a) nitrogen
(b) oxygen
(c) carbon dioxide
(d) argon

Alkendra Singh

Numerade Educator

Problem 31

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

Narayan Hari

Numerade Educator

Problem 32

Which pair of compounds is expected to show similar colour in aqueous medium?
(a) $\mathrm{FeCl}_{2}$ and $\mathrm{CuCl}_{2}$
(b) $\mathrm{VOCl}_{2}$ and $\mathrm{CuCl}_{2}$
(c) $\mathrm{VOCl}_{2}$ and $\mathrm{FeCl}_{2}$
(d) $\mathrm{FeCl}_{2}$ and $\mathrm{MnCl}_{2}$

Narayan Hari

Numerade Educator

Problem 33

$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ on heating liberates a gas. The same gas will be obtained by
(a) heating $\mathrm{NH}_{4} \mathrm{NO}_{2}$
(b) heating $\mathrm{NH}_{4} \mathrm{NO}_{3}$
(c) treating $\mathrm{H}_{2} \mathrm{O}_{2}$ with $\mathrm{NaNO}_{2}$
(d) treating $\mathrm{Mg}_{3} \mathrm{~N}_{2}$ with $\mathrm{H}_{2} \mathrm{O}$

Narayan Hari

Numerade Educator

Problem 34

The product of oxidation of $\mathrm{I}^{-}$with $\mathrm{MnO}_{4}^{-}$in alkaline medium is
(a) $\mathrm{IO}_{3}^{-}$
(b) $\mathrm{I}_{2}$
(c) IO-
(d) $\mathrm{IO}_{4}^{-}$

Alkendra Singh

Numerade Educator

Problem 35

When $\mathrm{MnO}_{2}$ is fused with $\mathrm{KOH}$, a coloured compound is formed, the product and its colour is:
(a) $\mathrm{K}_{2} \mathrm{MnO}_{4}$, purple green
(b) $\mathrm{KMnO}_{4}$, purple
(c) $\mathrm{Mn}_{2} \mathrm{O}_{3}$, brown
(d) $\mathrm{Mn}_{3} \mathrm{O}_{4}$, black

Narayan Hari

Numerade Educator

Problem 36

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 metallic iron with hydrochloric acid
(d) reaction of metallic iron with nitric acid

Narayan Hari

Numerade Educator

Problem 37

In the dichromate anion,
(a) $4 \mathrm{Cr}-\mathrm{O}$ bonds are equivalent
(b) $6 \mathrm{Cr}-\mathrm{O}$ bonds are equivalent
(c) all $\mathrm{Cr}-\mathrm{O}$ bonds are equivalent
(d) all $\mathrm{Cr}-\mathrm{O}$ bonds are nonequivalent

Narayan Hari

Numerade Educator

Problem 38

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) $\mathrm{CuCl}$.

Narayan Hari

Numerade Educator

Problem 39

The number of moles of $\mathrm{KMnO}_{4}$ that will be needed to react with one mole of sulphite ion in acidic solution is
(a) $\frac{2}{5}$
(b) $\frac{3}{5}$
(c) $\frac{4}{5}$
(d) 1

Narayan Hari

Numerade Educator

Problem 40

Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is
(a) $\mathrm{CrO}_{3}$
(b) $\mathrm{Cr}_{2} \mathrm{O}_{3}$
(c) $\mathrm{Cr}$
(d) $\mathrm{CrO}\left(\mathrm{O}_{2}\right)$

Narayan Hari

Numerade Educator

Problem 41

An aqueous solution of $\mathrm{FeSO}_{4}, \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$ and chrome alum is heated with excess of $\mathrm{Na}_{2} \mathrm{O}_{2}$ and filtered. The materials obtained are :
(a) a colourless filtrate and a green residue
(b) a yellow filtrate and a green residue
(c) a yellow filtrate and a brown residue
(d) a green filtrate and a brown residue

Narayan Hari

Numerade Educator

Problem 42

Which compound does not dissolve in hot, dilute $\mathrm{HNO}_{3} ?$
(a) $\mathrm{HgS}$
(b) PbS
(c) $\mathrm{CuS}$
(d) $\mathrm{CdS}$

Narayan Hari

Numerade Educator

Problem 43

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

Narayan Hari

Numerade Educator

Problem 44

Which pair gives $\mathrm{Cl}_{2}$ at room temperature?
(a) $\mathrm{HCl}_{\text {(conc) }}+\mathrm{KMnO}_{4}$
(b) $\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{SO}_{4(\text { conc })}$
(c) $\mathrm{NaCl}+\mathrm{MnO}_{2}$
(d) $\mathrm{NaCl}+\mathrm{HNO}_{3(\mathrm{conc})}$
(a) $\mathrm{Cu}(\mathrm{CN})_{2}$
(b) $\mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]$
(c) $\mathrm{K}\left[\mathrm{Cu}(\mathrm{CN})_{2}\right]$
(d) $\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]$

Narayan Hari

Numerade Educator

Problem 45

Which one is solder?
(a) $\mathrm{Cu} \& \mathrm{~Pb}$
(b) $\mathrm{Zn} \& \mathrm{Cu}$
(c) $\mathrm{Pb}$ \& $\mathrm{Sn}$
(d) $\mathrm{Fe} \& \mathrm{Zn}$

Narayan Hari

Numerade Educator

Problem 46

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

Narayan Hari

Numerade Educator

Problem 47

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

Narayan Hari

Numerade Educator

Problem 48

Sodium thiosulphate is used in photography because of its
(a) reducing behaviour
(b) oxidising behaviour
(c) complex forming behaviour
(d) reaction with light

Narayan Hari

Numerade Educator

Problem 49

How many unpaired electrons are present in $\mathrm{Ni}^{2+}$ ?
(a) 0
(b) 2
(c) 4
(d) 8

Narayan Hari

Numerade Educator

Problem 50

Which of the following dissolve in hot conc. $\mathrm{NaOH}$ solutio
(a) $\mathrm{Fe}$
(b) $\mathrm{Zn}$
(c) $\mathrm{Cu}$
(d) $\mathrm{Ag}$

Narayan Hari

Numerade Educator

Problem 51

One of the constituent of German silver is
(a) $\mathrm{Ag}$
(b) $\mathrm{Cu}$
(c) $\mathrm{Mg}$
(d) $\mathrm{Al}$

Narayan Hari

Numerade Educator

Problem 52

Which of the following is the weakest base
(a) $\mathrm{NaOH}$
(b) $\mathrm{Ca}(\mathrm{OH})_{2}$
(c) $\mathrm{KOH}$
(d) $\mathrm{Zn}(\mathrm{OH})_{2}$

Hitendra Singh

Numerade Educator

Problem 53

When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volume of hydrogen evolved is
(a) $1: 1$
(b) $1: 2$
(c) $2: 1$
(d) $9: 4$

Narayan Hari

Numerade Educator

Problem 54

An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of $1 \mathrm{~mL}$ of $3 \% \mathrm{H}_{2} \mathrm{O}_{2}$, a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound ' $\mathbf{X}$. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of $\mathbf{X}$ ?

Narayan Hari

Numerade Educator

Problem 55

In neutral or faintly alkaline solution, 8 moles of permanganate anion quantitatively oxidize thiosulphate anions to produce $X$ moles of a sulphur containing product. The magnitude of $X$ is

Narayan Hari

Numerade Educator

Problem 56

Consider the following list of reagents:
[Adv. 2014] Acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$, alkaline $\mathrm{KMnO}_{4}, \mathrm{CuSO}_{4}, \mathrm{H}_{2} \mathrm{O}_{2}, \mathrm{Cl}_{2}, \mathrm{O}_{3}, \mathrm{FeCl}_{3}, \mathrm{HNO}_{3}$ and
$\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$
The total number of reagents that can oxidise aqueous iodide to iodine is

Alkendra Singh

Numerade Educator

Problem 57

The oxidation number of $\mathrm{Mn}$ in the product of alkaline oxidative fusion of $\mathrm{MnO}_{2}$ is

Narayan Hari

Numerade Educator

Problem 58

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is

Narayan Hari

Numerade Educator

Problem 59

Consider the following reactions:
$\mathrm{NaCl}+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4}($ Conc. $) \rightarrow(\mathrm{A})+$ Side products
$(\mathrm{A})+\mathrm{NaOH} \rightarrow(\mathrm{B})+$ Side products
(B) $+\mathrm{H}_{2} \mathrm{SO}_{4}$ (dilute) $+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow(\mathrm{C})+$ Side products
The sum of the total number of atoms in one molecule each of $(\mathrm{A}),(\mathrm{B})$ and $(\mathrm{C})$ is $\square \square \square \square \square \square \square \square^{\sim}$

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 60

Silver jewellery items tarnish slowly in the air due to their reaction with $\ldots \ldots \ldots \ldots . .$

Narayan Hari

Numerade Educator

Problem 61

The salts ............... and ................ are isostructural. $\left(\mathrm{FeSO}_{4} .7 \mathrm{H}_{2} \mathrm{O}, \mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}, \mathrm{MnSO}_{4} .4 \mathrm{H}_{2} \mathrm{O}, \mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\right)$

Narayan Hari

Numerade Educator

Problem 62

Silver chloride is sparingly soluble in water because its lattice energy is greater than ........... energy.

Narayan Hari

Numerade Educator

Problem 63

Galvanization of iron denotes coating with ............... .

Narayan Hari

Numerade Educator

Problem 64

$\mathrm{Mn}^{2+}$ can be oxidised to $\mathrm{Mn} \mathrm{O}_{4}^{-}$by $\ldots \ldots \ldots \ldots \ldots .$
$\left(\mathrm{SnO}_{2}, \mathrm{PbO}_{2}, \mathrm{BaO}_{2}\right)$

Narayan Hari

Numerade Educator

Problem 65

AgCN dissolves in excess KCN solution to give the complex compound ............

Narayan Hari

Numerade Educator

Problem 66

Dipositive zinc exhibits paramagnetism due to loss of two electrons from $3 d$-orbital of neutral atom.

Narayan Hari

Numerade Educator

Problem 67

Silver chloride is more soluble in very concentrated sodium chloride solution than in pure water.

Narayan Hari

Numerade Educator

Problem 68

Silver fluoride is fairly soluble in water.

Narayan Hari

Numerade Educator

Problem 69

Fusion of $\mathrm{MnO}_{2}$ with $\mathrm{KOH}$ in presence of $\mathrm{O}_{2}$ produces a salt $W$. Alkaline solution of $W$ upon electrolytic oxidation yields another salt$X$. The manganese containing ions present in $\mathrm{W}$ and $X$, respectively are $Y$ and $Z$. Correct statement(s) is (are)
(a) In both $Y$ and $Z$, p-bonding occurs between $p$-orbitals of oxygen and $d$ orbitals of manganese
(b) In aqueous acidic solution, $Y$ undergoes dispro-portionation reaction to give $Z$ and $\mathrm{MnO}_{2}$
(c) Both $Y$ and $Z$ are coloured and have tetrahedral shape
(d) $Y$ is diamagnetic in nature while $Z$ is paramagnetic

Alkendra Singh

Numerade Educator

Problem 70

Consider the following reactions (unbalanced) $\mathrm{Zn}+$ hot conc. $\mathrm{H}_{2} \mathrm{SO}_{4} \square$ $G+R+X$
$\mathrm{Zn}+$ conc. $\mathrm{NaOH} \square T+Q$
$G+\mathrm{H}_{2} \mathrm{~S}+\mathrm{NH}_{4} \mathrm{OH} \square Z$ (a precipitate) $+X+Y$
Choose the correct option(s)
(a) The oxidation state of $\operatorname{Zn}$ in $T$ is $+1$
(b) Bond order of $Q$ is 1 in its ground state
(c) $Z$ is dirty white in colour
(d) $R$ is a V-shaped molecule

Narayan Hari

Numerade Educator

Problem 71

$\mathrm{Fe}^{3+}$ is reduced to $\mathrm{Fe}^{2+}$ by using
(a) $\mathrm{H}_{2} \mathrm{O}_{2}$ in presence of $\mathrm{NaOH}$
(b) $\mathrm{Na}_{2} \mathrm{O}_{2}$ in water
(c) $\mathrm{H}_{2} \mathrm{O}_{2}$ in presence of $\mathrm{H}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{Na}_{2} \mathrm{O}_{2}$ in presence of $\mathrm{H}_{2} \mathrm{SO}_{4}$

Narayan Hari

Numerade Educator

Problem 72

The correct statement(s) about $\mathrm{Cr}^{2+}$ and $\mathrm{Mn}^{3+}$ is (are) [Atomic numbers of $\mathrm{Cr}=24$ and $\mathrm{Mn}=25$ ]
(a) $\mathrm{Cr}^{2+}$ is a reducing agent
(b) $\mathrm{Mn}^{3+}$ is an oxidizing agent
(c) Both $\mathrm{Cr}^{2+}$ and $\mathrm{Mn}^{3+}$ exhibit $d^{4}$ electronic configuration
(d) When $\mathrm{Cr}^{2+}$ is used as a reducing agent, the chromium ion attains $d^{5}$ electronic configuration

Narayan Hari

Numerade Educator

Problem 73

The pair(s) of reagents that yield paramagnetic speciesis/are
(a) Na and excess of $\mathrm{NH}_{3}$
(b) $\mathrm{K}$ and excess of $\mathrm{O}_{2}$
(c) $\mathrm{Cu}$ and dilute $\mathrm{HNO}_{3}$
(d) $\mathrm{O}_{2}$ and 2 -ethylanthraquinol

Narayan Hari

Numerade Educator

Problem 74

For the given aqueous reactions, which of the statement (s) is (are) true?
excess $\mathrm{KI}+\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
$\stackrel{\text { dilute } \mathrm{H}_{2} \mathrm{SO}_{4}}{\longrightarrow}$
brownish- $\quad$ yellow solution $\int_{\downarrow} \mathrm{ZnSO}_{4}$
white precipitate $+\underbrace{\text { brownish - yellow filtrate }}_{1}$ colourless solution
(a) The first reaction is a redox reaction.
(b) White precipitate is $\mathrm{Zn}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{2}$.
(c) Addition of filtrate to starch solution gives blue colour.
(d) White precipitate is soluble in $\mathrm{NaOH}$ solution.

Narayan Hari

Numerade Educator

Problem 75

The equilibrium
${ }_{2} \mathrm{Cu}^{1} \rightleftharpoons \mathrm{Cu}^{0} \quad \mathrm{Cu}^{\mathrm{II}}$
in aqueous medium at $25^{\circ} \mathrm{C}$ shifts towards the left in the presence of
(a) $\mathrm{NO}_{3}^{-}$
(b) $\mathrm{Cl}^{-}$
(c) $\mathrm{SCN}^{-}$
(d) $\mathrm{CN}^{-}$

Alkendra Singh

Numerade Educator

Problem 76

Reduction of the metal centre in aqueous permanganate ion involves
(a) 3 electrons in neutral medium
(b) 5 electrons in neutral medium
(c) 3 electrons in alkaline medium
(d) 5 electrons in acidic medium

Narayan Hari

Numerade Educator

Problem 77

Addition of high proportions of manganese makes steel useful in making rails of railroads, because manganese
(a) gives hardness to steel
(b) helps the formation of oxides of iron
(c) can remove oxygen and sulphur
(d) can show highest oxidation state of $+7$.

Narayan Hari

Numerade Educator

Problem 78

Which of the following alloys contain(s) $\mathrm{Cu}$ and $\mathrm{Zn}$ ?
(a) Bronze
(b) Brass
(c) Gun metal
(d) Type metal

Narayan Hari

Numerade Educator

Problem 79

The aqueous solutions of the following salts will be coloured in the case of
(a) $\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$
(b) $\mathrm{LiNO}_{3}$
(c) $\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2}$
(d) $\mathrm{CrCl}_{3}$
(e) Potash alum

Narayan Hari

Numerade Educator

Problem 80

Potassium manganate $\left(\mathrm{K}_{2} \mathrm{MnO}_{4}\right)$ is formed when
(a) chlorine is passed into aqueous $\mathrm{KMnO}_{4}$ solution
(b) manganese dioxide is fused with potassium hydroxide in air
(c) formaldehyde reacts with potassium permanganate in presence of a strong alkali
(d) potassium permanganate reacts with conc. sulphuric acid

Narayan Hari

Numerade Educator

Problem 81

Match the catalysts (Column I) with products (Column II).
Column I $\quad$ Column II Catalyst

Product
(A) $\mathrm{V}_{2} \mathrm{O}_{5}$
(i) Polyethylene
(B) $\mathrm{TiCl}_{4} / \mathrm{Al}(\mathrm{Me})_{3}$
(ii) ethanol
(C) $\mathrm{PdCl}_{2}$
(iii) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(D) Iron Oxide
(iv) $\mathrm{NH}_{3}$
(a) (A)-(iii); (B)-(iv); (C)-(i); (D)-(ii)
(b) (A)-(ii); (B)-(iii); (C)-(i); (D)-(iv)
(c) (A)-(iii); (B)-(i); (C)-(ii); (D)-(iv)
(d) (A)-(iv); (B)-(iii); (C)-(ii); (D)-(i)

Vishal Sharma

Numerade Educator

Problem 82

Match each of the reactions given in Column I with the corresponding product(s) given in Column II.
Column I
(A) $\mathrm{Cu}+\mathrm{dil} \mathrm{HNO}_{3}$
(B) $\mathrm{Cu}+$ conc $\mathrm{HNO}_{3}$
(C) $\mathrm{Zn}+\operatorname{dil} \mathrm{HNO}_{3}$
(D) $\mathrm{Zn}+\mathrm{conc} \mathrm{HNO}_{3}$
Column II
(p) $\mathrm{NO}$
(q) $\mathrm{NO}_{2}$
(r) $\mathrm{N}_{2} \mathrm{O}$
(s) $\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}$
(t) $\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$

Alkendra Singh

Numerade Educator

Problem 83

Match the following, choosing one item from column $\mathbf{X}$ and one from column Y.
(i) $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$
(ii) $\left(\mathrm{NaPO}_{3}\right)_{n}$
(iii) $\mathrm{NO}_{3}^{-}$
(iv) $\mathrm{SnO}_{2}$
(v) $\quad \mathrm{KCl} . \mathrm{MgCl}_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}$
(vi) $\mathrm{AgNO}_{3}$
$\mathbf{X} \quad \mathbf{Y}$
(a) cassiterite
(b) lunar caustic
(c) producer gas
(d) water softener
(e) brown ring
test
(f) carnallite
(vii) $\mathrm{CO}+\mathrm{N}_{2}$
(g) calomel

Alkendra Singh

Numerade Educator

Problem 84

The metal rod $\mathbf{M}$ is
(a) $\mathrm{Fe}$
(b) $\mathrm{Cu}$
(c) $\mathrm{Ni}$
(d) $\mathrm{CO}$

Narayan Hari

Numerade Educator

Problem 85

The compound $\mathbf{N}$ is
(a) $\mathrm{AgNO}_{3}$
(b) $\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$
(c) $\mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3}$
(d) $\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$

Narayan Hari

Numerade Educator

Problem 86

The final solution contains
(a) $\mathrm{Pb}\left(\mathrm{NH}_{3}\right)_{4}^{2}$ and $\mathrm{CoCl}_{4}^{2}$
(b) $\mathrm{Al}\left(\mathrm{NH}_{3}\right)_{4}{ }^{3}$ and $\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}{ }^{2}$
(c) $\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}$ and $\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}^{2}$
(d) $\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}$ and $\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}^{2}$

Narayan Hari

Numerade Educator

Problem 87

For the following Assertion and Reason, the correct option is:
Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group $7-9$ elements. Reason: The reactants are most strongly adsorbed on group $7-9$ elements.
(a) The assertion is true, but the reason is false.
(b) Both assertion and reason are false.
(c) Both assertion and reason are true and the reason is the correct explanation for the assertion.
(d) Both assertion and reason are true but the reason is not the correct explanation for the assertion.

Narayan Hari

Numerade Educator

Problem 89

Statement-1: To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange. Statement-2 : The colour change is due to the oxidation of potassium chromate.

Narayan Hari

Numerade Educator

Problem 90

$\mathrm{MCl}_{4} \stackrel{\mathrm{Zn}}{\longrightarrow}$ Purple colour compound;
(Colourless $\quad(A)$
liquid) $\quad M=$ Transition metal $\mathrm{MCl}_{4} \stackrel{\text { moist air }}{\longrightarrow} \quad(B)$
Identify $(A),(B)$ and $\mathrm{MCl}_{4}$. Also explain colour difference between $M \mathrm{Cl}_{4}$ and $(A)$.

Lijeesh Krishnan

Lijeesh Krishnan

Numerade Educator

Problem 91

Write the chemical reaction involved in developing of a black and white photographic film. An aqueous $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ solution is acidified to give a milky white turbitity. Identify the product and write the balanced half chemical reaction for it.

Narayan Hari

Numerade Educator

Problem 92

(i) Write the chemical reactions involved in the extraction of metallic silver from argentite.
(ii) Write the balanced chemical equation for developing photographic films.

Alkendra Singh

Numerade Educator

Problem 93

Write the chemical reaction associated with the 'brown ring test'.

Narayan Hari

Numerade Educator

Problem 94

Work out the following using chemical equations .In moist air copper corrodes to produce a green layer on the surface.

Narayan Hari

Numerade Educator

Problem 95

Compare qualitatively the first and second ionisation potentials of copper and zinc. Explain the observation.

Nidhi Singhi

Numerade Educator

Problem 96

The acidic, aqueous solution of ferrous ion forms a brown complex in the presence of $\mathrm{NO}_{3}^{-}$, by the following two steps. Complete and balance the equations:
$\begin{aligned}\left[\mathrm{Fc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}+\mathrm{NO}_{3}^{-}+\mathrm{H}^{+} \rightarrow \ldots . .+\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}_{6}\right)\right]^{3+}+\mathrm{H}_{2} \mathrm{O} \\\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}+\ldots \ldots . & \rightarrow \ldots . . .+\mathrm{H}_{2} \mathrm{O} \end{aligned}$

Narayan Hari

Numerade Educator

Problem 97

Mention the products formed when zinc oxide is treated with excess of sodium hydroxide solution.

Narayan Hari

Numerade Educator

Problem 98

What happens when :
(i) aqueous ammonia is added dropwise to a solution of copper sulphate till it is in excess.
(ii) $\mathrm{CrCl}_{3}$ solution is treated with sodium hydroxide and then with hydrogen peroxide.

Alkendra Singh

Numerade Educator

Problem 99

State the conditions under which the following preparation is carried out. Potassium permanganate from manganese hydroxide. Give the necessary equations which need not be balanced.

Narayan Hari

Numerade Educator

Problem 100

Give reasons for the following :
(i) $\mathrm{CrO}_{3}$ is an acid anhydride.
(ii) The species $\left[\mathrm{CuCl}_{4}\right]^{2-}$ exists while $\left[\mathrm{CuI}_{4}\right]^{2-}$ does not.
(iii) The colour of mercurous chloride, $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$, changes from white to black when treated with ammonia.
(iv) Zinc and not copper is used for the recovery of metallic silver from complex $\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-}$. Explain.
(v) Most transition metal compounds are coloured.
(vi) Silver bromide is used in photography.

Lottie Adams

Numerade Educator

Problem 101

State with balanced equations what happens when:
(i) Write balanced equations for the reaction of zinc with dilute nitric acid.
(ii) Write a balanced equation for the reaction of argentite with $\mathrm{KCN}$ and name the products in solution.
(iii) $\left[\mathrm{MnO}_{4}\right]^{2-}+\mathrm{H}^{+} \longrightarrow \ldots \ldots \ldots+\left[\mathrm{MnO}_{4}\right]^{-}+\mathrm{H}_{2} \mathrm{O}$
(iv) $\mathrm{SO}_{2}(\mathrm{aq})+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+2 \mathrm{H}^{+} \longrightarrow \ldots \ldots+\ldots \ldots+\ldots \ldots$
(v) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{~S}_{2} \mathrm{O}_{8}+\mathrm{H}_{2} \mathrm{O}+\mathrm{MnSO}_{4} \rightarrow \ldots .+\ldots \ldots+\ldots \ldots .$
(vi) $\quad \mathrm{AgBr}+\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \rightarrow \ldots+\ldots \ldots$

(vii) Potassium dichromate and concentrated hydrochloric acid are heated together.
(viii) $\mathrm{Na}_{2} \mathrm{CO}_{3}$ is added to a solution of copper sulphate. $\mathrm{CuSO}_{4}+\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \ldots \ldots \ldots .+\mathrm{Na}_{2} \mathrm{SO}_{4}+\ldots \ldots \ldots$
$(i x)$ Copper reacts with $\mathrm{HNO}_{3}$ to give $\mathrm{NO}$ and $\mathrm{NO}_{2}$ in molar ratio of $2: 1$. $\mathrm{Cu}+\mathrm{HNO}_{3} \rightarrow \ldots \ldots \ldots . .+\mathrm{NO}+\mathrm{NO}_{2}+\ldots \ldots \ldots \ldots$
$(x)$ Potassium permanganate is added to a hot solution of manganous sulphate.
( $x i$ ) $\quad$ Iron reacts with cold dilute nitric acid.
(xii) A mixture of potassium dichromate and sodium chloride is heated with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$.
(xiii) Write balanced equations for the extraction of copper from copper pyrites by self-reduction.
(xiv) Cobalt(II) solution reacts with $\mathrm{KNO}_{2}$ in acetic acid medium.
(xv) Silver chloride is treated with aqueous sodium cyanide and the product thus formed is allowed to react with zinc in alkaline medium.
(xvi) Write balanced equations for the extraction of silver from silver glance by cyanide process.
(xvii) Gold is dissolved in aqua regia.
(xviii) Potassium permanganate is reacted with warm solution of oxalic acid in the presence of sulphuric acid.
( $x i x)$ potassium ferrocyanide is heated with concentrated sulphuric acid;
$(x x)$ potassium permanganate interacts with manganese dioxide in presence of potassium hydroxide;
$(x x i)$ aqueous solution of potassium chromate and acid are mixed.
(xxii) aqueous solution of potassium manganate and acid are mixed.
(xxiii) aqueous solution of ferric sulphate and potassium iodide are mixed.
(xxiv) sulphur dioxide gas is bubbled through an aqueous solution of copper sulphate in presence of potassium thiocyanate.

Susan Hallstrom

Susan Hallstrom

Numerade Educator

Problem 102

Complete the following equation (no balancing is needed):
$\mathrm{SO}_{2}+\mathrm{MnO}_{4}^{-}+\ldots . \mathrm{SO}_{4}^{2-}+\mathrm{Mn}^{2+}+\ldots$

Narayan Hari

Numerade Educator

Problem 103

A solution of $\mathrm{FeCl}_{3}$ in water gives a brown precipitate on standing.

Narayan Hari

Numerade Educator

Problem 104

State with balanced equations, what happens when
(i) Silver is treated with hot concentrated sulphuric acid.
(ii) Ammonium dichromate is heated.
(iii) Hydrogen sulphide is passed through a solution of potassium permanganate acidified with dilute sulphuric acid.

Narayan Hari

Numerade Educator

Problem 105

A white amorphous powder (A) on heating yields a colourless, noncombustible gas (B) and a solid (C). The latter compound assumes a yellow colour on heating and changes to white on cooling. ' $C$ ' dissolves in dilute acid and the resulting solution gives a white precipitate on adding $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ solution. A' dissolves in dilute HCl with the evolution of gas, which is identical in all respects with ' $\mathrm{B}$ '. The gas 'B' turns lime water milky, but the milkiness disappears with the continuous passage of gas. The solution of ' $A$ ', as obtained above, gives a white precipitate (D) on the addition of excess of $\mathrm{NH}_{4} \mathrm{OH}$ and passing $\mathrm{H}_{2} \mathrm{~S}$. Another portion of the solution gives initially a white precipitate (E) on the addition of sodium hydroxide solution, which dissolves on futher addition of the base. Identify the compounds $\mathrm{A}, \mathrm{B}, \mathrm{D}$, and $\mathrm{E}$.

Nikhil Choudhary

Nikhil Choudhary

Numerade Educator

Problem 106

A certain inorganic compound (A) on heating loses its water of crystallisation. On further heating, a blackish brown powder (B) and two oxides of sulphur (C and D) are obtained. The powder (B) on boiling with hydrochloric acid gives a yellow solution (E). When $\mathrm{H}_{2} \mathrm{~S}$ is passed in (E) a white turbidity (F) and an apple green solution (G) are obtained. The solution (E) on treatment with thiocyanate ions gives a blood red coloured compound (H). Identify compounds from
(A) to $(\mathrm{H})$.

Nidhi Singhi

Numerade Educator