Objective Chemistry for NEET Vol II

Pearson Education

Chapter 7

The p-Block Elements- Oxygen Family VIA-Group Elements - all with Video Answers

Educators

Chapter Questions

Problem 1

Polyanion formation is maximum in
(a) Boron
(b) Oxygen
(c) Nitrogen
(d) Sulphur

Mishal Gul

Mishal Gul

Numerade Educator

Problem 2

The geometry of $\mathrm{H}_{2} \mathrm{~S}$ and its dipole moment are
(a) Angular and non-zero
(b) Angular and zero
(c) Linear and non-zero
(d) Linear and zero

Hitendra Singh

Numerade Educator

Problem 3

Which one of the following ion has the highest value of ionic radius?
(a) $\mathrm{F}^{-}$
(b) $\mathrm{O}^{2-}$
(c) $\mathrm{B}^{3+}$
(d) $\mathrm{Li}^{+}$

Hitendra Singh

Numerade Educator

Problem 4

Maximum coordination number of oxygen in liquid water is
(a) 5
(b) 4
(c) 3
(d) 2

Mishal Gul

Numerade Educator

Problem 5

The acid which has a peroxy linkage is
(a) Dithionic acid
(b) Sulphurous acid
(c) Caro's acid
(d) Pyrosulphuric acid

Mishal Gul

Numerade Educator

Problem 6

In $\mathrm{SO}_{3}^{2-}$ :
(a) There is $\mathrm{sp}^{3}$ hybridised sulphur atom
(b) Bonds between $\mathrm{S}$ and $\mathrm{O}$ are equivalents
(c) $\mathrm{d} \pi-\mathrm{p} \pi$ bond between $\mathrm{S}$ and $\mathrm{O}$ is delocalized
(d) All the facts given here are true

Mishal Gul

Numerade Educator

Problem 7

Which of the following form of sulphur can be prepared by pouring liquid sulphur into cold water?
(a) Colloidal
(b) Plastic
(c) Monoclinic
(d) Rhombic

Mishal Gul

Numerade Educator

Problem 8

Which one of the sixth group elements has the highest catenation power?
(a) $\mathrm{O}$
(b) $\mathrm{S}$
(c) Se
(d) $\mathrm{Te}$

Shahina -

Numerade Educator

Problem 9

Which has highest oxidation state here for sulphur atom?
(a) $\mathrm{H}_{2} \mathrm{~S}$
(b) $\mathrm{SO}_{2}$
(c) $\mathrm{H}_{2} \mathrm{SO}_{3}$
(d) $\mathrm{H}_{2} \mathrm{SO}_{4}$

Mishal Gul

Numerade Educator

Problem 10

Which has maximum number of allotropes here?
(a) $\mathrm{S}$
(b) $\mathrm{O}$
(c) Se
(d) $\mathrm{Te}$

Mishal Gul

Numerade Educator

Problem 11

The bond angle of $\mathrm{H}_{2} \mathrm{X}$ (where $\mathrm{X}$ is a VIth group element) as one goes down the group
(a) Charges irregularly
(b) Increases
(c) Does not change
(d) Decreases

Mishal Gul

Numerade Educator

Problem 12

What are the allotropes of oxygen?
(a) $\mathrm{O}_{2}, \mathrm{O}_{3}$ and $\mathrm{O}_{4}$
(b) $\mathrm{O}, \mathrm{O}_{2}$ and $\mathrm{O}_{3}$
(c) $\mathrm{O}_{2}$ and $\mathrm{O}_{3}$
(d) $\mathrm{O}$ and $\mathrm{O}_{2}$

Mishal Gul

Numerade Educator

Problem 13

$\mathrm{SO}_{2}$ behaves as a reducing agent when
(a) Passed through $\mathrm{FeSO}_{4}$ solution
(b) Passed over hot $\mathrm{CuO}$
(c) Mixed with moist $\mathrm{H}_{2} \mathrm{~S}$
(d) Passed through acidified $\mathrm{KMnO}_{4}$ solution

Raghvendra Singh

Raghvendra Singh

Numerade Educator

Problem 14

There is $\mathrm{p} \pi-\mathrm{d} \pi$ multiple bonding in
(a) $\mathrm{CO}_{2}$
(b) $\mathrm{NO}_{2}$
(c) $\mathrm{CS}_{2}$
(d) $\mathrm{NO}$

Mishal Gul

Numerade Educator

Problem 15

Which one of the following hydrides is least acidic?
(a) $\mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{H}_{2} \mathrm{~S}$
(c) $\mathrm{H}_{2} \mathrm{Te}$
(d) $\mathrm{H}_{2} \mathrm{O}$

Mishal Gul

Numerade Educator

Problem 16

Which one of the following pairs of reactant does not form oxygen when they react with each other?
(a) $\mathrm{Cl}_{2}, \mathrm{NaOH}$ solution (cold, dilute)
(b) $\mathrm{F}_{2}, \mathrm{NaOH}$ solution (hot, conc.)
(c) $\mathrm{F}_{2} \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{CaOCl}_{2}, \mathrm{H}_{2} \mathrm{SO}_{4}$ (dilute, small amount)

Mishal Gul

Numerade Educator

Problem 17

In which of the following compounds, oxygen exhibits an oxidation state of $+2$ ?
(a) $\mathrm{H}_{2} \mathrm{O}_{2}$
(b) $\mathrm{OF}_{2}$
(c) $\mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{H}_{2} \mathrm{SO}_{4}$

Mishal Gul

Numerade Educator

Problem 18

Which of the following oxy acid of sulphur does not contain $\mathrm{S}-\mathrm{S}$ bond?
(a) Pyrosulphuric acid
(b) Dithionic acid
(c) Dithionous acid
(d) Pyrosulphurous acid

Mishal Gul

Numerade Educator

Problem 19

By the action of hot concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$, phosphorous changes to
(a) Phosphorous acid
(b) Orthophosphoric acid
(c) Metaphosphoric acid
(d) Pyrophosphoric acid

Mishal Gul

Numerade Educator

Problem 20

Oxygen does not react with
(a) $\mathrm{Na}$
(b) $\mathrm{P}$
(c) $\mathrm{Cl}$
(d) $\mathrm{S}$

Narayan Hari

Numerade Educator

Problem 21

Which of the following ions does not have $\mathrm{S}-\mathrm{S}$ linkage?
(a) $\mathrm{S}_{2} \mathrm{O}_{6}^{2-}$
(b) $\mathrm{S}_{2} \mathrm{O}_{8}^{2}$
(c) $\mathrm{S}_{2} \mathrm{O}_{5}^{2-}$
(d) $\mathrm{S}_{2} \mathrm{O}_{3}^{2 .}$

Mishal Gul

Numerade Educator

Problem 22

What is the catalyst used in the manufacture of sulphuric acid by contact process?
(a) Ni powder
(b) Platinised asbestos
(c) Anhydrous $\mathrm{Al}_{2} \mathrm{O}_{3}$
(d) Al powder

Mishal Gul

Numerade Educator

Problem 23

Aqueous hyposolution on reaction with aqueous $\mathrm{AgNO}_{3}$ gives
(a) White ppt. changing to black
(b) Orange ppt. changing to blue
(c) Yellow ppt. changing to black
(d) No ppt.

Mishal Gul

Numerade Educator

Problem 24

Test for ozone is
(a) Tailing of mercury
(b) Nesseler's reagent
(c) Million's base
(d) None of these

Mishal Gul

Numerade Educator

Problem 25

Arrange the following acids:
1. $\mathrm{H}_{2} \mathrm{SO}_{3}$
2. $\mathrm{H}_{3} \mathrm{PO}_{3}$
3. $\mathrm{HClO}_{3}$
in the increasing order of acid strength
(a) $2>3>1$
(b) $3>2>1$
(c) $1>3>2$
(d) $1>2>3$

Nidhi Singhi

Numerade Educator

Problem 26

The gas produced when ammonium bisulphide is added to an aqueous solution of aluminium sulfate is
(a) $\mathrm{SO}_{3}$
(b) $\mathrm{SO}_{2}$
(c) $\mathrm{S}$
(d) $\mathrm{H}_{2} \mathrm{~S}$

Mishal Gul

Numerade Educator

Problem 27

When an article is bleached by $\mathrm{SO}_{2}$ it loses its colour. The colour can be restored by
(a) Heating
(b) Exposure to air
(c) Dilution
(d) None of these

Taniya Khandelwal

Taniya Khandelwal

Numerade Educator

Problem 28

The absorption of UV radiation by $\mathrm{O}_{3}$ :
(a) Makes both the function effective
(b) Makes no function effective
(c) Maintains an equilibrium between the concentrations of $\mathrm{O}_{2}$ and $\mathrm{O}_{3}$
(d) Protects the inhabitants of out planet from injurious radiation

Mishal Gul

Numerade Educator

Problem 29

The number of paired and unpaired electrons in the valence shell of the members of oxygen family are
(a) 2,4
(b) 4,2
(c) 2,3
(d) 3,3

Mishal Gul

Numerade Educator

Problem 30

Water is oxidized to oxygen by
(a) $\mathrm{H}_{2} \mathrm{O}_{2}$
(b) $\mathrm{KMnO}_{4}$
(c) $\mathrm{ClO}_{2}$
(d) Fluorine

Narayan Hari

Numerade Educator

Problem 31

The gas $\mathrm{O}_{3}$ (ozone) can not oxidise
(a) $\mathrm{KI}$
(b) $\mathrm{FeSO}_{4}$
(c) $\mathrm{KMnO}_{4}$
(d) $\mathrm{K}_{2} \mathrm{MnO}_{4}$

Mishal Gul

Numerade Educator

Problem 32

Concentrated sulphuric acid is:
(a) Oxidising agent
(b) Sulphonating agent
(c) Hygroscopic
(d) All of these

Mishal Gul

Numerade Educator

Problem 33

Hg sticks to the surface of the glass when it comes in contact with
(a) $\mathrm{O}_{3}$
(b) $\mathrm{HNO}_{3}$
(c) $\mathrm{H}_{2} \mathrm{O}$
(d) Grease

Mishal Gul

Numerade Educator

Problem 34

When $\mathrm{SO}_{2}$ is passed through acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution
(a) The solution is decolourised
(b) The solution is turned blue
(c) Green $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$ is formed
(d) $\mathrm{SO}_{2}$ is reduced

Mishal Gul

Numerade Educator

Problem 35

$\mathrm{CFCl}_{3}$ is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen?
(a) $\mathrm{Cl}_{2}$
(b) $\mathrm{Cl}^{-}$
(c) F"
(d) $\mathrm{Cl}^{*}$

Narayan Hari

Numerade Educator

Problem 36

What is $\mathrm{X}$ in the following reaction? $\mathrm{KHSO}_{4}+\mathrm{F}_{2} \rightarrow \mathrm{HF}+\mathrm{X}$
(a) $\mathrm{K}_{2} \mathrm{SO}_{4}$
(b) $\mathrm{K}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}$
(c) $\mathrm{K}_{2} \mathrm{~S}_{2} \mathrm{O}_{2}$
(d) $\mathrm{K}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$

Mishal Gul

Numerade Educator

Problem 37

Which of the following is a true peroxide?
(a) $\mathrm{BaO}_{2}$
(b) $\mathrm{SO}_{2}$
(c) $\mathrm{NO}_{2}$
(d) $\mathrm{MnO}_{2}$

Meera Devi

Numerade Educator

Problem 38

Which one is known as Caro's acid?
(a) $\mathrm{H}_{2} \mathrm{SO}_{3}$
(b) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$
(c) $\mathrm{H}_{2} \mathrm{SO}_{5}$
(d) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$

Mishal Gul

Numerade Educator

Problem 39

$\mathrm{SO}_{2}+\mathrm{Cl}_{2} \stackrel{\text { Sunlight }}{\longrightarrow}$ Product
The product is
(a) Chloroform
(b) Sulphuryl chloride
(c) Sulphuric acid
(d) None of these

Mishal Gul

Numerade Educator

Problem 40

Which of the following is a weak acid in its aqueous solution?
(a) $\mathrm{H}_{2} \mathrm{Po}$
(b) $\mathrm{H}_{2} \mathrm{~S}$
(c) $\mathrm{H}_{2} \mathrm{Se}$
(d) $\mathrm{H}_{2} \mathrm{Te}$

Mishal Gul

Numerade Educator

Problem 41

Which compound acts as an oxidizing as well as reducing agent?
(a) $\mathrm{SO}_{2}$
(b) $\mathrm{MnO}_{2}$
(c) $\mathrm{Al}_{2} \mathrm{O}_{3}$
(d) $\mathrm{CrO}_{3}$

Mishal Gul

Numerade Educator

Problem 42

In which of the following reactions ozone acts as reducing reagent?
(a) $2 \mathrm{HCl}+\mathrm{O}_{3} \rightarrow \mathrm{Cl}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$
(b) $\mathrm{BaO}_{2}+\mathrm{O}_{3} \rightarrow \mathrm{BaO}+2 \mathrm{O}_{2}$
(c) $2 \mathrm{KI}+\mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{KOH}+\mathrm{I}_{2}+\mathrm{O}_{2}$
(d) $\mathrm{PbS}+4 \mathrm{O}_{3} \rightarrow \mathrm{PbSO}_{4}+4 \mathrm{O}_{2}$

Mishal Gul

Numerade Educator

Problem 43

The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are
(a) $\mathrm{O}_{2}, \mathrm{O}_{3}$
(b) $\mathrm{N}_{2} \mathrm{O}, \mathrm{O}_{3}$
(c) $\mathrm{SO}_{2}, \mathrm{CH}_{4}$
(d) $\mathrm{O}_{3}, \mathrm{CH}_{4}$

Narayan Hari

Numerade Educator

Problem 44

The number of $S-S$ bonds in sulphur trioxide trimer $\left(\mathrm{S}_{3} \mathrm{O}_{9}\right)$ is
(a) Three
(b) Two
(c) One
(d) Zero

Narayan Hari

Numerade Educator

Problem 45

Which of the following has more acidic character?
(a) $\mathrm{H}_{2} \mathrm{Se}$
(b) $\mathrm{H}_{2} \mathrm{~S}$
(c) $\mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{H}_{2} \mathrm{Te}$

Mishal Gul

Numerade Educator

Problem 46

When $\mathrm{NaNO}_{3}$ is heated with $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$ a colourless gas \& a residue is obtained. The colour of residue is
(a) Red
(b) Brown
(c) White
(d) Black

Mishal Gul

Numerade Educator

Problem 47

The product obtained at anode when $50 \% \mathrm{H}_{2} \mathrm{SO}_{4}$ aqueous solution is electrolysed using platinum electrodes is
(a) $\mathrm{H}_{2}$
(b) $\mathrm{O}_{2}$
(c) $\mathrm{H}_{2} \mathrm{SO}_{3}$
(d) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$

Mishal Gul

Numerade Educator

Problem 48

Sulphur trioxide is dissolved in heavy water to form a compound $\mathrm{X}$, the hybridisation state of sulphur in $\mathrm{X}$ is
(a) sp
(b) $\mathrm{sp}^{2}$
(c) $\mathrm{sp}^{3}$
(d) $\mathrm{dsp}^{2}$

Mishal Gul

Numerade Educator

Problem 49

Passing $\mathrm{H}_{2} \mathrm{~S}$ gas through nitric acid produces
(a) Monoclinic sulphur
(b) Rhombic sulphur
(c) Plastic sulphur
(d) Amorphous sulphur

Mishal Gul

Numerade Educator

Problem 50

Which one of the following is an oxyacid?
(a) $\mathrm{H}_{3} \mathrm{PO}_{3}$
(b) $\mathrm{Mg}(\mathrm{OH})_{2}$
(c) $\mathrm{Ba}(\mathrm{OH})_{2}$
(d) $\mathrm{HCl}$

Mishal Gul

Numerade Educator

Problem 51

Which of the following species is basic and reducing?
(a) $\mathrm{SO}_{4}^{2-}$
(b) $\mathrm{SO}_{3}^{2-}$
(c) $\mathrm{HSO}_{4}^{-}$
(d) $\mathrm{S}_{2} \mathrm{O}_{4}^{2-}$

Mishal Gul

Numerade Educator

Problem 52

A bottle completely filled with concentrated. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is left unstoppered for several days and we observe spontaneous overflow of acid. It is due to:
(a) Dehydration of $\mathrm{H}_{2} \mathrm{SO}_{4}$
(b) Absorption of air by $\mathrm{H}_{2} \mathrm{SO}_{4}$
(c) Hygroscopic nature of $\mathrm{H}_{2} \mathrm{SO}_{4}$
(d) Change in temperature

Mishal Gul

Numerade Educator

Problem 53

Which of the following has $\mathrm{S}-\mathrm{S}$ bond?
(a) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$
(b) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}$
(c) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$
(d) Mustard gas

Mishal Gul

Numerade Educator

Problem 54

Concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ displaces hydrogen chloride from chloride s because
(a) Sulphates are more soluble than chlorides
(b) HCl is a gas while $\mathrm{H}_{2} \mathrm{SO}_{4}$ is a liquid
(c) It is a stronger acid
(d) Sulphates are less soluble than chlorides

Mishal Gul

Numerade Educator

Problem 55

Which of the following molecular species has unpaired electrons?
(a) $\mathrm{F}_{2}$
(b) $\mathrm{N}_{2}$
(c) $\mathrm{O}_{2}^{2-}$
(d) $\mathrm{O}_{2}^{-}$

Mishal Gul

Numerade Educator

Problem 56

Which of the following has least bond angle?
(a) $\mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{H}_{2} \mathrm{~S}$
(c) $\mathrm{H}_{2} \mathrm{Se}$
(d) $\mathrm{H}_{2} \mathrm{Te}$

Mishal Gul

Numerade Educator

Problem 57

$\mathrm{SO}_{2}$ will be obtained in:
(a) $\mathrm{PbS}+$ air
(b) $\mathrm{FeS}_{2}+$ air
(c) $\mathrm{ZnS}+$ air
(d) All of these

Mishal Gul

Numerade Educator

Problem 58

The acid having $\mathrm{O}-\mathrm{O}$ bond is
(a) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$
(b) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}$
(c) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{\mathrm{B}}$
(d) $\mathrm{H}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}$

Preeti Kumari

Numerade Educator

Problem 59

How many types of $\mathrm{F}-\mathrm{S}-\mathrm{F}$ bonds are present in $\mathrm{SF}_{4} ?$
(a) 5
(b) 4
(c) 3
(d) 2

Mishal Gul

Numerade Educator

Problem 60

Photoconductors of Xerox machine uses
(a) Black phosphorous
(b) Tellurium
(c) Mercury
(d) Selenium

Mishal Gul

Numerade Educator

Problem 61

What is the product formed when ozone reacts with mercury?
(a) $\mathrm{HgO}_{2}$
(b) $\mathrm{Hg}_{2} \mathrm{O}_{2}$
(c) $\mathrm{HgO}$
(d) $\mathrm{Hg}_{2} \mathrm{O}$

Mishal Gul

Numerade Educator

Problem 62

The manufacture of sulphuric acid by the contact process involves the catalyst
(a) $\mathrm{Ag}_{2} \mathrm{O}$
(b) $\mathrm{CdO}$
(c) $\mathrm{V}_{2} \mathrm{O}_{5}$
(d) Platinum coated graphite

Mishal Gul

Numerade Educator

Problem 63

A considerable part of the harmful UV rays of the sun does not reach the surface of the earth. This is because high above the earth's atmosphere, there is a layer of
(a) $\mathrm{CO}_{2}$
(b) $\mathrm{O}_{3}$
(c) NO
(d) $\mathrm{SO}_{2}$

Mishal Gul

Numerade Educator

Problem 64

$\mathrm{O}_{2}^{2 \cdot}$ is the symbol of $\ldots \ldots \ldots$ ion.
(a) Oxide
(b) Peroxide
(c) Monoxide
(d) Super oxide

Mishal Gul

Numerade Educator

Problem 65

Which of the following is the strongest acid?
(a) $\mathrm{ClO}_{3}(\mathrm{OH})$
(b) $\mathrm{ClO}_{2}(\mathrm{OH})$
(c) $\mathrm{SO}(\mathrm{OH})_{2}$
(d) $\mathrm{SO}_{2}(\mathrm{OH})_{2}$

Narayan Hari

Numerade Educator

Problem 66

Which one of the following substances has the highest proton affinity?
(a) $\mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{H}_{2} \mathrm{~S}$
(c) $\mathrm{NH}_{3}$
(d) $\mathrm{PH}_{3}$

Himanshu Kushwaha

Himanshu Kushwaha

Numerade Educator

Problem 67

$\mathrm{S}_{2} \mathrm{Cl}_{2}$ hydrolyses slowly to form $\mathrm{HCl}, \mathrm{SO}_{2}$ and $\mathrm{X}$ which of the following is $\mathrm{X} ?$
(a) $\mathrm{H}_{2}$
(b) $\mathrm{O}_{2}$
(c) $\mathrm{S}$
(d) $\mathrm{SO}_{3}$

Mishal Gul

Numerade Educator

Problem 68

Of the following set which one does not contain isoelectronic species?
(a) $\mathrm{CN}^{-}, \mathrm{N}_{2}, \mathrm{C}_{2}^{2-}$
(b) $\mathrm{PO}_{4}^{3}, \mathrm{SO}_{4}^{2-}, \mathrm{ClO}_{4}-$
(c) $\mathrm{SO}_{3}^{2-}, \mathrm{CO}_{3}^{2-}, \mathrm{NO}_{3}^{4}-$
(d) $\mathrm{BO}_{3}{ }^{3-}, \mathrm{CO}_{3}{ }^{2-}, \mathrm{NO}_{3}-$

Mishal Gul

Numerade Educator

Problem 69

Shape of $\mathrm{O}_{2} \mathrm{~F}_{2}$ is similar to that of
(a) $\mathrm{H}_{2} \mathrm{O}_{2}$
(b) $\mathrm{C}_{2} \mathrm{H}_{2}$
(c) $\mathrm{C}_{2} \mathrm{~F}_{2}$
(d) $\mathrm{H}_{2} \mathrm{~F}_{2}$

Mishal Gul

Numerade Educator

Problem 70

Which of the following oxides can act as oxidizing as well as reducing agent?
(a) $\mathrm{SO}_{2}$
(b) $\mathrm{SO}_{2}$
(c) Both $\mathrm{SO}_{2}$, and $\mathrm{SO}_{3}$
(d) Neither $\mathrm{SO}_{2}$ nor $\mathrm{SO}_{3}$

Mishal Gul

Numerade Educator

Problem 71

Which of the following chemical reactions depicts the oxidizing behaviour of $\mathrm{H}_{2} \mathrm{SO}_{4} ?$
(a) $2 \mathrm{HI}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{I}_{2}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{CaSO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
(c) $\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{NaHSO}_{4}+\mathrm{HCl}$
(d) $2 \mathrm{PCl}_{5}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow 2 \mathrm{POCl}_{3}+2 \mathrm{HCl}+\mathrm{SO}_{2} \mathrm{Cl}_{2}$

Mishal Gul

Numerade Educator

Problem 72

Which of the following is correct?
(a) $\mathrm{H}_{2} \mathrm{SO}_{4}$ forms various hydrates with $\mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{H}_{2} \mathrm{SO}_{4}$ is colourless syrupy liquid
(c) Highly corrosive in nature $\mathrm{k}$
(d) All of these

Mishal Gul

Numerade Educator

Problem 73

Which of the following species has the smallest concentration in $98 \% \mathrm{H}_{2} \mathrm{SO}_{4}$ ?
(a) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(b) $\mathrm{HSO}_{4}^{-}$
(c) $\mathrm{SO} 4_{2}^{+}$
(d) $\mathrm{H}_{3} \mathrm{O}^{+}$

Mishal Gul

Numerade Educator

Problem 74

Which of the following has the lowest bond angle?
(a) $\mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{CH}_{4}$
(c) $\mathrm{H}_{2} \mathrm{~S}$
(d) $\mathrm{NH}_{3}$

Shahina -

Numerade Educator

Problem 75

Which statement is not representative of the chemistry of $\mathrm{H}_{2} \mathrm{~S} ?$
(a) It is a weak reducing agent.
(b) It is an extremely toxic substance.
(c) It has a linear geometry.
(d) It is weak diprotic acid.

Mishal Gul

Numerade Educator

Problem 76

$\mathrm{KClO}_{3}$ on reaction with $\mathrm{SO}_{2}$ gives $(\mathrm{X})$ and on reaction with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ gives $(\mathrm{Y}) \cdot(\mathrm{X})$ and $(\mathrm{Y})$ are:
(a) $\mathrm{KCl}, \mathrm{HClO}_{3}$
(b) $\mathrm{KCl}, \mathrm{HClO}_{2}$
(c) $\mathrm{KCl}, \mathrm{HClO}_{4}$
(d) $\mathrm{Cl}_{2}, \mathrm{ClO}_{2}$

Mishal Gul

Numerade Educator

Problem 77

Oxidation number of sulphur in $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$ is
(a) $+6$
(b) $+8$
(c) $+21$
(d) $+7$

Mishal Gul

Numerade Educator

Problem 78

When $5.60 \mathrm{~g}$ of anhydrous copper (II) sulphate is exposed to moist air, it absorbs water. If the hydrated copper compound has a mass of $8.13 \mathrm{~g}$, what is the chemical formula of the hydrate?
(a) $\mathrm{CuSO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O}$
(b) $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$
(c) $\mathrm{CuSO}_{4} \cdot 4 \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{CuSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$

Mishal Gul

Numerade Educator

Problem 79

Oxygen is more electronegative than sulphur, yet $\mathrm{H}_{2} \mathrm{~S}$ is acidic in nature while $\mathrm{H}_{2} \mathrm{O}$ is neutral because
(a) $\mathrm{H}-\mathrm{S}$ is weaker than $\mathrm{O}-\mathrm{H}$ bond
(b) $\mathrm{H}_{2} \mathrm{~S}$ is a gas at ordinary temperature while $\mathrm{H}_{2} \mathrm{O}$ is a liquid
(c) Water has higher boiling point than $\mathrm{H}_{2} \mathrm{~S}$
(d) Water molecules are associated due to intermolecular hydrogen bonding

Mishal Gul

Numerade Educator

Problem 80

$\mathrm{SO}_{2}$ acts as temporary bleaching agent but $\mathrm{Cl}_{2}$ acts as permanent bleaching agent. Why?
(a) $\mathrm{Cl}_{2}$ bleaches due to oxidation but $\mathrm{SO}_{2}$ due to reduction.
(b) $\mathrm{Cl}_{2}$ bleaches due to reduction but $\mathrm{SO}_{2}$, due to oxidation.
(c) Both (a) and (b)
(d) None of these

Nidhi Singhi

Numerade Educator

Problem 81

Which one of the following pairs of reactant does not form oxygen when they react with each other?
(a) $\mathrm{Cl}_{2}, \mathrm{NaOH}$ solution (cold, dilute)
(b) $\mathrm{F}_{2}, \mathrm{NaOH}$ solution (hot, conc.)
(c) $\mathrm{F}_{2} \mathrm{H}_{2} \mathrm{O}$
(d) $\mathrm{CaOCl}_{2}, \mathrm{H}_{2} \mathrm{SO}_{4}$ (dilute, small amount)

Mishal Gul

Numerade Educator

Problem 82

When sulphur is boiled with $\mathrm{Na}_{2} \mathrm{SO}_{3}$ solution, the compound formed is
(a) Sodium sulphide
(b) Sodium sulphate
(c) Sodium persulphate
(d) Sodium thiosulphate

Mishal Gul

Numerade Educator

Problem 83

Hypo is sued in photography for
(a) Seveloping picture
(b) Picture printing
(c) The colour of picture
(d) The fixation of picture

Mishal Gul

Numerade Educator

Problem 84

Indicate the trend in increasing bond length for molecular oxygen, the peroxide ion and superoxide ion.
(a) $\mathrm{O}_{2}^{2 \cdot}>\mathrm{O}_{2}>\mathrm{O}^{2-}$
(b) $\mathrm{O}_{2}^{2 \cdot}>\mathrm{O}_{2}^{-}>\mathrm{O}_{2}$
(c) $\mathrm{O}_{2}>\mathrm{O}_{2}^{-}>\mathrm{O}_{2}^{\frac{2}{2}}$
(d) $\mathrm{O}_{2}>\mathrm{O}_{2}^{2}>\mathrm{O}^{2-}$

Mishal Gul

Numerade Educator

Problem 85

Amongst $\mathrm{H}_{2} \mathrm{O}, \mathrm{H}_{2} \mathrm{~S}, \mathrm{H}_{2} \mathrm{Se}$ and $\mathrm{H}_{2} \mathrm{Te}$, the one with the
highest boiling point is
(a) $\mathrm{H}_{2}$ Te because of higher molecular weight
(b) $\mathrm{H}_{2} \mathrm{O}$ because of hydrogen bonding
(c) $\mathrm{H}_{2}$ Se because of lower molecular weight
(d) $\mathrm{H}_{2} \mathrm{~S}$ because of hydrogen bonding

Narayan Hari

Numerade Educator

Problem 86

How many milliliters of ozone gas at $25^{\circ} \mathrm{C}$ and $1.00$ atm pressure are needed to react with $45.00 \mathrm{ml}$ of a $0.100 \mathrm{M}$ aqueous solution of $\mathrm{KI}$ according to the following chemical equation:
$\mathrm{O}_{3}(\mathrm{~g})+2 \mathrm{I}^{-}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow$
$\mathrm{O}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~s})+2 \mathrm{OH}^{-}(\mathrm{aq})$
(a) $110 \mathrm{ml}$
(b) $155 \mathrm{ml}$
(c) $250 \mathrm{ml}$
(d) $55 \mathrm{ml}$

Mishal Gul

Numerade Educator

Problem 87

A $7.63 \mathrm{~g}$ sample of hydrated magnesium sulphate $\mathrm{MgSO}_{4} \cdot \mathrm{xH}_{2} \mathrm{O}$ is heated until all of the water is driven off. If $3.72$ grams of anhydrous $\mathrm{MgSO}_{4}$ is obtained, how many water molecules combined with each formula unit of magnesium sulphate in the hydrate?
(a) 6
(b) 7
(c) 8
(d) 9

Mishal Gul

Numerade Educator

Problem 88

Which of the following gas mixture is used by the divers inside the sea?
(a) $\mathrm{O}_{2}+\mathrm{Ar}$
(b) $\mathrm{O}_{2}+\mathrm{He}$
(c) $\mathrm{O}_{2}+\mathrm{Xe}$
(d) $\mathrm{O}_{2}+\mathrm{N}_{2}$

Mishal Gul

Numerade Educator

Problem 89

How is $\mathrm{H}_{2} \mathrm{~S}$ prepared in laboratory?
(a) $\mathrm{FeS}+\mathrm{dil} \mathrm{H}_{2} \mathrm{SO}_{4}$
(b) $\mathrm{FeSO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}$
(c) $\mathrm{FeS}+$ conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$
(d) Elementary $\mathrm{H}_{2}+$ elementary $\mathrm{S}$

Himanshu Kushwaha

Himanshu Kushwaha

Numerade Educator

Problem 90

In which of the following pairs, both members show reducing property but not oxidizing property:
(a) $\mathrm{H}_{3} \mathrm{PO}_{2}, \mathrm{H}_{2} \mathrm{~S}$
(b) $\mathrm{PH}_{3}, \mathrm{H}_{2} \mathrm{~S}$
(c) $\mathrm{H}_{2} \mathrm{~S}, \mathrm{H}_{2} \mathrm{O}_{2}$
(d) $\mathrm{SO}_{2}, \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$

Mishal Gul

Numerade Educator

Problem 91

Oxalic acid is heated with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4} .$ When the resultant gases are passed over red hot carbon, $X$ is obtained. $\mathrm{X}$ is
(a) $\mathrm{CO}$
(b) $\mathrm{CO}_{2}$
(c) $\mathrm{C}_{2} \mathrm{H}_{4}$
(d) $\mathrm{CH}_{4}$

Narayan Hari

Numerade Educator

Problem 92

$[\mathrm{X}]+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow[\mathrm{Y}]$ a colourless gas with irritating smell
$[\mathrm{Y}]+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow$ Green solution $[\mathrm{X}]$ and $[\mathrm{Y}]$
are
(a) $\mathrm{Cl}^{-}, \mathrm{HCl}$
(b) $\mathrm{SO}_{3}^{2-}, \mathrm{SO}_{2}$
(c) $\mathrm{CO}_{3}^{2-}, \mathrm{CO}_{2}$
(d) $\mathrm{S}^{2-}, \mathrm{H}_{2} \mathrm{~S}$

Mishal Gul

Numerade Educator

Problem 93

Sulphur reacts with chlorine in $1: 2$ ratio and forms
(X). (X) on hydrolysis gives a sulphur compound (Y). What is the hybridized state of central atom in the anion of $(\mathrm{Y})$ ?
(a) $\mathrm{sp}^{3} \mathrm{~d}$
(b) $\mathrm{sp}^{2}$
(c) $\mathrm{sp}^{3}$
(d) sp

Mishal Gul

Numerade Educator

Problem 94

Which of the following solutions does not change its colour on passing ozone through it?
(a) Acidified solution of $\mathrm{FeSO}_{4}$
(b) Acidic solution of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$
(c) Alcoholic solution of benzidine
(d) Atarch iodide solution

Mishal Gul

Numerade Educator

Problem 95

In the reactions:
(a) $\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{O}_{3} \rightarrow \mathrm{H}_{2} \mathrm{O}+2 \mathrm{O}_{2}$
(b) $\mathrm{PbS}+4 \mathrm{O}_{3} \rightarrow \mathrm{PbSO}_{4}+4 \mathrm{O}_{2}$
(a) $\mathrm{O}_{2}$ is reduced in (a) and oxidized in (b)
(b) $\mathrm{O}_{3}$ is oxidized in (a) and reduced in (b)
(c) $\mathrm{O}_{3}$ is reduced both in (a) and (b)
(d) $\mathrm{O}_{3}$ is oxidized both in (a) and (b)

Mishal Gul

Numerade Educator

Problem 96

In which of the following molecules/ions are all the bonds not equal?
(a) $\mathrm{SF}_{4}$
(b) $\mathrm{SiF}_{4}$
(c) $\mathrm{XeF}_{4}$
(d) $\mathrm{BF}_{4}$

Mishal Gul

Numerade Educator

Problem 97

Estimation of ozone can be made quantitatively by
(a) Decomposition into $\mathrm{O}_{2}$ and adsorption of $\mathrm{O}_{2}$ into pyrogallol
(b) Oxidation ozonolysis method
(c) Volumetric method using KI and titration of the liberated iodine using hypo solution
(d) All method given above

Mishal Gul

Numerade Educator

Problem 98

The formation of $\mathrm{O}_{2}^{+}\left[\mathrm{PtF}_{6}\right]^{-}$ is the basis for the formation of xenon fluorides. This is because
(a) Both $\mathrm{O}_{2}$ and $\mathrm{Xe}$ are gases
(b) $\mathrm{O}_{2}$ and Xe have comparable sizes
(c) $\mathrm{O}_{2}$ and $\mathrm{Xe}$ have comparable electronegativities
(d) $\mathrm{O}_{2}$ and Xe have comparable ionization energies

Mishal Gul

Numerade Educator

Problem 99

The brown ring test for nitrates depends upon
(a) Oxidation of nitric oxide to nitrogen dioxide
(b) The reduction of nitrate to nitric oxide
(c) Oxidising action of sulphuric acid
(d) Reduction of ferrous sulphate to iron

Mishal Gul

Numerade Educator

Problem 100

$\mathrm{CS}_{2}$ on reaction with $\mathrm{KN}_{3}$ followed by reaction with $\mathrm{H}_{2} \mathrm{O}_{2}$ gives a pseudo halogen whose structure contains:
(a) Two carbon - nitrogen bonds, the charge of each nitrogen is dispersed through resonance just on other nitrogen only.
(b) No carbon - nitrogen bonds and 6 lone pairs of electrons per molecule
(c) No $\mathrm{S}-\mathrm{S}$ bond and 12 lone pairs per molecule
(d) One $\mathrm{S}-\mathrm{S}$ bond and 14 lone pairs per molecule

Mishal Gul

Numerade Educator

Problem 101

$\mathrm{H}_{2} \mathrm{SO}_{4}$ is not used for the preparation of $\mathrm{CO}_{2}$ from marble chips because
(a) Calcium sulphate is sparingly soluble and get deposited on marble chips and stops the reaction
(b) It does not react
(c) The reaction is vigorous
(d) Huge amount of heat is evolved

Narayan Hari

Numerade Educator

Problem 102

Which of the following is correct?
(a) $\mathrm{S}_{3} \mathrm{O}_{9}-$ contains no $\mathrm{S}-\mathrm{S}$ linkage
(b) $\mathrm{S}_{2} \mathrm{O}_{6}^{2-}-$ contains $-\mathrm{O}-\mathrm{O}$ - linkage
(c) $\left(\mathrm{HPO}_{3}\right)_{3}-$ contains $\mathrm{P}-\mathrm{P}$ linkage
(d) $\mathrm{S}_{2} \mathrm{O}_{8}^{2-}$ contains $\mathrm{S}-\mathrm{S}$ linkage

Mishal Gul

Numerade Educator

Problem 103

Sodium thiosulphate is prepared by
(a) Reducing $\mathrm{Na}_{2} \mathrm{SO}_{4}$ solution with $\mathrm{H}_{2} \mathrm{~S}$
(b) Boiling $\mathrm{Na}_{2} \mathrm{SO} 3$ solution with $\mathrm{S}$ in alkaline medium
(c) Neutralizing $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ solution with $\mathrm{NaOH}$
(d) Boiling $\mathrm{Na}_{2} \mathrm{SO}_{3}$ solution with $\mathrm{S}$ in acidic medium

Taniya Khandelwal

Taniya Khandelwal

Numerade Educator

Problem 104

In case of oxygen family (group -16)
(a) The tendency for catenation decreases markedly as we go down the group
(b) Maximum coordination of oxygen is four due to lack of d-orbital but that of other elements is six due to presence of d-orbitals
(c) The tendency to form multiple bonds with $\mathrm{C}, \mathrm{N}$ and $O$ decreases as going down the group from $\mathrm{S}$ to $\mathrm{Te}$.
(d) All are correct

Mishal Gul

Numerade Educator

Problem 105

The increased viscosity of molten sulphur at $160-195^{\circ} \mathrm{C}$ is due to the
(a) Opening of the $\mathrm{S}_{\mathrm{g}}$ rings which then polymerise into long chains
(b) Opening of the $\mathrm{S}_{\mathrm{g}}$ rings to give smaller $\mathrm{S}$ units
(c) Melting of $\mathrm{S}_{8}$ to give discrete $\mathrm{S}_{8}$ units
(d) Merging of the $\mathrm{S}_{8}$ rings to give interlocking $\mathrm{S}_{8}$ rings

Mishal Gul

Numerade Educator

Problem 106

Which trioxide of group 16 elements exists as a cyclic tetramer in the solid state?
(a) $\mathrm{TeO}_{3}$
(b) $\mathrm{SO}_{3}$
(c) $\mathrm{SeO}_{3}$
(d) Both $\mathrm{SO}_{3} \& \mathrm{SeO}_{3}$

Mishal Gul

Numerade Educator

Problem 107

In the reaction $\mathrm{A}+2 \mathrm{~B}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}+2 \mathrm{D}$ if $\mathrm{A}$ is $\mathrm{HNO}_{2}$
and $\mathrm{C}$ is $\mathrm{NH}_{2} \mathrm{OH}$ then $\mathrm{B}$ and $\mathrm{D}$ are respectively
(a) $\mathrm{H}_{2} \mathrm{SO}_{4}$ and $\mathrm{SO}$
(b) $\mathrm{H}_{2} \mathrm{SO}_{4}$ and $\mathrm{H}_{2} \mathrm{SO}_{3}$
(c) $\mathrm{H}_{2} \mathrm{SO}_{3}$ and $\mathrm{H}_{2} \mathrm{SO}_{4}$
(d) $\mathrm{H}_{2} \mathrm{SO}_{3}$ and $\mathrm{SO}_{2}$

Mishal Gul

Numerade Educator

Problem 108

Describe the colour changes when sulphur (melting point $113^{\circ} \mathrm{C}$, boiling point $445^{\circ} \mathrm{C}$ ) is heated from $25^{\circ} \mathrm{C}$ to $500^{\circ} \mathrm{C}$ ? It turns from a yellow solid to a
(a) Yellow liquid and then it boils
(b) Straw colour liquid which turns dark reddish brown and then it boils
(c) Dark reddish brown liquid and then boils
(d) Reddish brown solid and then into reddish brow liquid and then boils.

Mishal Gul

Numerade Educator

Problem 109

Which is correct about $\mathrm{TeCl}_{4}$ ?
(1) In it Te is sp $^{3} \mathrm{~d}$ hybridized
(2) It has 4 bp and 1 lp electrons on Te atom
(3) It is having T - shape
(4) It reacts with $\mathrm{HCl}$ to give $\mathrm{H}_{2}$ TeCl6
(a) $1,2,3$ (b) $1,3,4$
(c) $2,3,4$ (d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 110

Which is a convenient synthetic method for the preparation of $\mathrm{SO}_{2}$ ?
(a) $\mathrm{S}_{8}(\mathrm{~s})+8 \mathrm{O}_{2}(\mathrm{~g})+$ heat $\rightarrow 8 \mathrm{SO}_{2}(\mathrm{~g})$
(b) $2 \mathrm{SO}_{3}(\mathrm{~g})+$ heat $\rightarrow 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})$
(c) $\mathrm{FeSO}_{3}(\mathrm{~s})+$ heat $\rightarrow \mathrm{FeO}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{~g})$
(d) $\mathrm{H}_{2} \mathrm{SO}_{3}(\mathrm{aq}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{SO}_{2}(\mathrm{aq})$

Mishal Gul

Numerade Educator

Problem 111

Which of the following is correct?
(1) Ozone is used to identify the presence of unsaturation in alkenes
(2) Sodium thiosulphate reacts with iodine to form sodium suphate
(3) Iodine oxidizes sodium thiosulphate to sodium tetrathionate
(4) Sodium thiosulphate is soluble in water
(a) $1,2,3$
(b) $1,3,4$
(c) $2,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 112

A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas
(a) Which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas (b) with same constituent atoms as that of (a) is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has trigonal bipyramidal geometry. Gases (a) and (b) are respectively:
(a) $\mathrm{SF}_{6}$ and $\mathrm{SF}_{4}$
(b) $\mathrm{SF}_{4}$ and $\mathrm{SF}_{6}$
(c) $\mathrm{SF}_{4}$ and $\mathrm{S}_{2} \mathrm{~F}_{2}$
(d) $\mathrm{KCl}$ and $\mathrm{KBr}$

Nidhi Singhi

Numerade Educator

Problem 113

What are appropriate methods for the generation of $\mathrm{H}_{2} \mathrm{~S}$ ?
(1) $\mathrm{CH}_{3} \mathrm{C}(\mathrm{CS}) \mathrm{NH}_{2}$ (aq) $+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+$ Heat $\rightarrow$
$\mathrm{CH}_{3}(\mathrm{CO}) \mathrm{NH}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{~S}$ (aq)
(2) $\mathrm{FeS}(\mathrm{s})+2 \mathrm{H}+$ (aq) $\rightarrow \mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})+\mathrm{Fe}_{2}+(\mathrm{aq})$
(3) $2 \mathrm{SO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow 2 \mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})+3 \mathrm{O}_{2}(\mathrm{~g})$
(4) $3 \mathrm{~S}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{SO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})$
(a) Reactions 1 and 3
(b) Reactions 3 and 4
(c) Reaction 1 and 2
(d) Reactions 2 and 4

Mishal Gul

Numerade Educator

Problem 114

Among $\mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}, \mathrm{P}_{2} \mathrm{O}_{3}$ and $\mathrm{SO}_{2}$ the incorrect order
of acid strength is
(1) $\mathrm{Al}_{2} \mathrm{O}_{3}<\mathrm{SiO}_{2}<\mathrm{SO}_{2}<\mathrm{P}_{2} \mathrm{O}_{3}$
(2) $\mathrm{Al}_{2} \mathrm{O}_{3}<\mathrm{SiO}_{2}<\mathrm{P}_{2} \mathrm{O}_{3}<\mathrm{SO}_{2}$
(3) $\mathrm{SiO}_{2}<\mathrm{SO}_{2}<\mathrm{Al}_{2} \mathrm{O}_{3}<\mathrm{P}_{2} \mathrm{O}_{3}$
(4) $\mathrm{SO}_{2}<\mathrm{P}_{2} \mathrm{O}_{3}<\mathrm{SiO}_{2}<\mathrm{Al}_{2} \mathrm{O}_{3}$
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) 1,4

Mishal Gul

Numerade Educator

Problem 115

A sulphate of a metal (a) on heating evolves two gases
(b) and (c) and an oxide. Gas (b) turns $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ paper green while gas (c) forms a trimer in which there is no $\mathrm{S}-\mathrm{S}$ bond. Compound (d) with $\mathrm{HCl}$, forms a Lewis base (E) which exists as a dimmer. Compounds (a),
(b), (c), (d) and (E) are respectively.
(a) $\mathrm{FeS}, \mathrm{SO}_{2}, \mathrm{SO}_{3}, \mathrm{FeSO}_{4}, \mathrm{FeCl}_{3}$
(b) $\mathrm{FeS}, \mathrm{SO}_{2}, \mathrm{SO}_{3}, \mathrm{Fe}_{2}(\mathrm{PO} 4)_{3}, \mathrm{FeCl}_{2}$
(c) $\mathrm{FeSO}_{4}, \mathrm{SO}_{2}, \mathrm{SO}_{3}, \mathrm{Fe}_{2} \mathrm{O}_{3}, \mathrm{FeCl}_{3}$
(d) $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}, \mathrm{SO}_{2}, \mathrm{SO}_{3}, \mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{FeCl}_{3}$

Mishal Gul

Numerade Educator

Problem 116

Pick out the correct statement.
(1) $\mathrm{SF}_{4}$ is a gas and has regular tetrahedral structure
(2) $\mathrm{SF}_{6}$ in highly unreactive towards hydrolysis
(3) In $\mathrm{SF}_{6}$, 'S' atom is in the state of $\mathrm{sp}_{3} \mathrm{~d}_{2}$ hybridisation
(4) The oxides of fluorine are properly called oxygen fluorides
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 117

Select the correct statements about $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \cdot 5 \mathrm{H}_{2} \mathrm{O}$.
(1) It cannot used to remove stains of $\mathrm{I} 2$.
(2) It is also called as hypo
(3) It can be used as antichlor
(4) It is used in photography to form complex with $\mathrm{AgBr}$
(a) $1,2,3$ (b) 2,4
(c) $1,3,4$ (d) $2,3,4$

Mishal Gul

Numerade Educator

Problem 118

Which statement about $\mathrm{H}_{2} \mathrm{~S}$ is true?
(1) It is a covalent compound
(2) It is a gas with bad smell
(3) It is a weak base in water
(4) It is a stronger reducing agent than $\mathrm{H}_{2} \mathrm{O}$
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 119

The incorrect order of bond angles (smallest first) in $\mathrm{H}_{2} \mathrm{~S}, \mathrm{NH}_{3}, \mathrm{BF}_{3}$, and $\mathrm{SiH}_{4}$ is
(1) $\mathrm{H}_{2} \mathrm{~S}<\mathrm{NH}_{3}<\mathrm{BF}_{3}<\mathrm{SiH}_{4}$
(2) $\mathrm{H}_{2} \mathrm{~S}<\mathrm{NH}_{3}<\mathrm{SiH}_{4}<\mathrm{BF}_{3}$
(3) $\mathrm{NH}_{3}<\mathrm{H}_{2} \mathrm{~S}<\mathrm{SiH}_{4}<\mathrm{BF}_{3}$
(4) $\mathrm{H}_{2} \mathrm{~S}<\mathrm{SiH}_{4}<\mathrm{NH}_{3}<\mathrm{BF}_{3}$
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 120

Pick out the correct statement with respect to $\mathrm{SO}_{3}$.
(1) It reacts explosively with $\mathrm{H}_{2} \mathrm{O}$ to form $\mathrm{H}_{2} \mathrm{SO}_{4}$.
(2) It does not react with HBr.
(3) In solid state, $\mathrm{SO}_{3}$ exists as cyclic trimer in which four oxygen atoms are arranged approximately tetrahedrally around each 'S' atom.
(4) In presence of moisture, cyclic trimer changes into linear polymerized structure.
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 121

In which of the following reactions, $\mathrm{H}_{2} \mathrm{O}_{2}$ acts as an oxidant?
(1) $\mathrm{PbO}_{2}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}_{2}$ (aq) $\rightarrow \mathrm{PbO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{O}_{2}(\mathrm{~g})$
(2) $\mathrm{KNO}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow \mathrm{KNO}_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(1)$
(3) $2 \mathrm{KI}$ (aq) $+\mathrm{H}_{2} \mathrm{O}_{2}$ (aq) $\rightarrow 2 \mathrm{KOH}$ (aq) $+\mathrm{I}_{2}(\mathrm{~s})$
(4) $\mathrm{Na}_{2} \mathrm{SO}_{3}$ (aq) $+\mathrm{H}_{2} \mathrm{O}_{2}$ (aq) $\rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}$ (I)
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 122

In the following sequence of reaction the product formed
(a) and the necessary conditions (b) are PbS Heat $\mathrm{PbS} \frac{\mathrm{Heat}}{\mathrm{in} \text { air }} \mathrm{A}+\mathrm{PbS} \stackrel{\mathrm{B}}{\longrightarrow} \mathrm{Pb}+\mathrm{SO}_{2}$
(a) $\mathrm{PbSO}_{4}$ and high temperature, absence of air
(b) PbO and high temperature, absence of air
(c) $\mathrm{PbO}$ and low temperature
(d) Both (a) and (b)

Mishal Gul

Numerade Educator

Problem 123

With respect to both oxygen and ozone which one of the following statements is correct?
(1) Oxygen has 2 bonds and ozone has 3 bonds.
(2) Oxygen valency is 2 in both.
(3) Oxygen is colourless and ozone is coloured.
(4) Both have similar reactivity with water.
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 124

Which elements of group $6 \mathrm{~A}$ are oxidizing agents and which are reducing agents?
(a) $\mathrm{O}$ and $\mathrm{Se}$ are reducing agents while $\mathrm{S}$ and Te are oxidizing agents.
(b) $\mathrm{O}$ and $\mathrm{S}$ are reducing agents while Se and Te are oxidizing agents.
(c) $\mathrm{O}$ and $\mathrm{S}$ are oxidizing agents while Se and Te are reducing agents.
(d) $\mathrm{O}$ and $\mathrm{Se}$ are oxidizing agents while $\mathrm{S}$ and $\mathrm{Te}$ are reducing agents.

Mishal Gul

Numerade Educator

Problem 125

Pick out correct statement for $\mathrm{H}_{2} \mathrm{SO}_{4}$.
(1) $\mathrm{Zn}$ reduces concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{~S} .$
(2) $\mathrm{Cu}$ is oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to form only $\mathrm{H}_{2} \mathrm{~S}$.
(3) Carbon or sulphur are oxidized by concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to the respective dioxides
(4) But-1-ene when hydrated in presence of concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ form butan- 2 -ol
(a) $1,3,4$ (b) $2,3,4$
(c) 1,3 , (d) $1,2,3,4$

Mishal Gul

Numerade Educator

Problem 126

Which of the following statement is not correct?
(a) Decreasing order of bond angle of hydrides of chalcogens is $\mathrm{H}_{2} \mathrm{O}>\mathrm{H}_{2} \mathrm{~S}>\mathrm{H}_{2} \mathrm{Se}>\mathrm{H}_{2} \mathrm{Te}$
(b) Decreasing order of stability of hexafluorides of $S$, Se and Te is $\mathrm{SF}_{6}>\mathrm{SeF}_{6}>\mathrm{TeF}_{6}$
(c) Decreasing order of tendency to undergo hydrolysis is $\mathrm{TeF}_{6}>\mathrm{SeF}_{6}>\mathrm{SF}_{6}$
(d) All are correct

Mishal Gul

Numerade Educator

Problem 127

A compound (a) of $\mathrm{S}, \mathrm{Cl}$ and $\mathrm{O}$ has vapour density of 67.5. It reacts with water to form two acids and reacts with KOH to form two salts (b) and (c). while (b) gives white precipitate with $\mathrm{AgNO}_{3}$ solution, (c) gives white precipitate with $\mathrm{BaCl}_{2}$ solution. Identify (a) Here:
(a) $\mathrm{SOCl}_{2}$
(b) $\mathrm{SO}_{2} \mathrm{Cl}_{2}$
(c) $\mathrm{SO}_{2} \mathrm{Cl}$
(d) None of these

Nidhi Singhi

Numerade Educator

Problem 128

Pick out the correct statement.
(1) $\mathrm{Te}=\mathrm{C}=\mathrm{Te}$ is unknown
(2) The tendency for catenation is markedly shown by sulphur
(3) $\mathrm{S}_{2}$ is diamagnetic, but $\mathrm{O}_{2}$ is paramagnetic
(4) The $+4$ oxidation state is relatively more stable for Se, Te and Po than $+6$ O.S, but opposite trend holds good for $\mathrm{S}$.
(a) $1,2,3$
(b) $2,3,4$
(c) $1,3,4$
(d) $1,2,4$

Mishal Gul

Numerade Educator

Problem 129

Molecular shapes of $\mathrm{SF}_{4}, \mathrm{CF}_{4}$, and $\mathrm{XeF}_{4}$ are
(a) The same, with 2,0 , and 1 lone pairs of electrons respectively.
(b) The same, with 1,1 , and 1 lone pairs of electrons respectively.
(c) Different, with 0,1 , and 2 lone pairs of electrons respectively.
(d) Different, with 1,0 , and 2 lone pairs of electrons respectively.

Raghvendra Singh

Raghvendra Singh

Numerade Educator

Problem 130

Consider the following statements about hydrogen peroxide:
1. The extent of hydrogen bonding in $\mathrm{H}_{2} \mathrm{O}_{2}$ is less than that in water.
2. It is an important rocket fuel.
3. It is used in cosmetics for bleaching hair.
(a) Only 3 is correct
(b) 2 and 3 are correct
(c) 1 and 2 are correct
(d) 1,2 and 3 are correct

Mishal Gul

Numerade Educator

Problem 131

It is possible to obtain oxygen from air by fractional distillation because
(a) Oxygen has a lower density than nitrogen.
(b) Oxygen has high b.p. than nitrogen.
(c) Oxygen is more reactive than nitrogen
(d) Oxygen is in a different group of the periodic table from nitrogen.

Mishal Gul

Numerade Educator

Problem 132

A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is
(a) KI
(b) $\mathrm{K}_{3} \mathrm{PO}_{4}$
(c) $\mathrm{KBr}$
(d) $\mathrm{K}_{2} \mathrm{CO}_{3}$

Nidhi Singhi

Numerade Educator

Problem 133

Which of the following is not arranged correctly in increasing order of the character given?
(a) $\mathrm{H}_{2} \mathrm{O}<\mathrm{SiO}_{2}<\mathrm{CO}_{2}<\mathrm{N}_{2} \mathrm{O}_{5}-$ Acidity
(b) $\mathrm{N}_{2}<\mathrm{O}_{2}<\mathrm{Br}_{2}<\mathrm{Cl}_{2}<\mathrm{I}_{2}-$ Bond length
(c) $\mathrm{HI}<\mathrm{HBr}<\mathrm{HCl}<\mathrm{HF}$ - Bond strength
(d) All of these

Mishal Gul

Numerade Educator

Problem 134

Thiosulphuric acid is:

Mishal Gul

Numerade Educator

Problem 135

What statement is not characteristic about group $6 \mathrm{~A}$ elements?
(a) $\mathrm{S}, \mathrm{Se}$ and Te are much less electronegative than oxygen and commonly have positive oxidation states.
(b) The favoured oxidation state of Te and Po is $+2$.
(c) Oxygen and sulphur are typical non-metals while selenium and tellurium are semi metals.
(d) Oxygen is a powerful oxidizing agent but $\mathrm{H}_{2} \mathrm{Se}$ and $\mathrm{H}_{2} \mathrm{Te}$ are good reducing agents.

Mishal Gul

Numerade Educator

Problem 136

Which one of the following reactions represents the reducing property of $\mathrm{H}_{2} \mathrm{O}_{2}$ ?
(1) $2 \mathrm{NaI}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{I}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
(2) $\mathrm{PbO}_{2}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{PbO}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$
(3) $2 \mathrm{KMnO}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+8 \mathrm{H}_{2} \mathrm{O}+5 \mathrm{O}_{2}$
(4) $2 \mathrm{~K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+2 \mathrm{KOH}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{~K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
$+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$
(a) 1,2
(b) 1,3
(c) $2,3,4$
(d) $1,3,4$

Mishal Gul

Numerade Educator

Problem 137

Pick out the correct statement regarding $\mathrm{H}_{2} \mathrm{SO}_{4}$.
(1) Concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ cannot oxidize $\mathrm{HBr}$ and $\mathrm{HI}$ to form $\mathrm{Br}_{2}$ and $\mathrm{I} 2$ respectively.
(2) Concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ reacts with $\mathrm{NaNO}_{3}$ or $\mathrm{Na}_{2} \mathrm{SO}_{3}$
(3) Glucose when treated with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ forms carbon.
(4) When treated with $\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{HCOOH}$ forms $\mathrm{CO}$ and $\mathrm{H}_{2} \mathrm{O}$.
(a) $1,3,4$
(b) $2,3,4$
(c) 1,3 ,
(d) $1,2,3,4$

Mishal Gul

Numerade Educator

Problem 138

When moist coloured flowers are added into $\mathrm{SO}_{2}$ gas, the flowers are decolourised because
(a) $\mathrm{SO}_{2}$ oxidises vegetable colouring matter
(b) $\mathrm{SO}_{2}$ absorbs colouring matter
(c) $\mathrm{SO}_{2}$ gives colourless product
(d) $\mathrm{SO}_{2}$ reduces vegetable colouring matter

Mishal Gul

Numerade Educator

Problem 139

What is/are characteristic of ozone, $\mathrm{O}_{3}$ ?
(1) The $\mathrm{O}-\mathrm{O}$ distances are not equivalent.
(2) It is a non linear triatomic system.
(3) It is made by passing an electrical discharge through oxygen.
(4) It is an extremely powerful oxidizing agent.
(a) $1,3,4$
(b) $2,3,4$
(c) 1,3
(d) All of these

Mishal Gul

Numerade Educator

Problem 140

The species that undergo disproportionation in an alkaline medium are
1. $\mathrm{Cl}_{2}$
2. $\mathrm{MnO}_{4}^{2-}$
3. $\mathrm{NO}_{2}$
4. $\mathrm{ClO}_{4}^{\circ}$
(a) 1,2
(b) 1,3
(c) $1,3,4$
(d) $1,2,3,4$

Mishal Gul

Numerade Educator

Problem 141

Which of the following is correct structure of $\mathrm{S}_{2} \mathrm{Cl}_{2} ?$
(a)
<smiles>S=[SH](Cl)(Cl)Cl</smiles>
(b) $\mathrm{Cl}-\mathrm{S}-\mathrm{S}-\mathrm{Cl}$
(c)
(d) $\mathrm{Cl}-\mathrm{S}=\mathrm{S}-\mathrm{Cl}$.

Mishal Gul

Numerade Educator