Oxygen family MCQs

Question 1

Ozone is formed in the upper layer of the atmosphere by

Accepted Answer

Action of UV rays on O 2

Answer

Combination of O 2

Answer

High pressure on O 2

Answer

Action of electric discharge on O 2

Question 2

Ozone is

Accepted Answer

An allotrope of oxygen

Answer

An isomer of oxygen

Answer

An isotope of oxygen

Answer

Isostructural with H 2 O 2

Question 3

Which of the following compounds produce holes in ozone layer in the upper atmosphere?

Accepted Answer

Freon

Answer

Sulphur dioxide

Answer

Carbon dioxide

Answer

Carbon monoxide

Question 4

Ozone can be detected by using

Accepted Answer

Ag

Answer

Na

Answer

Hg

Answer

Ar

Question 5

Bleaching property is shown by all except:

Accepted Answer

O 2

Answer

Cl 2

Answer

SO 2

Answer

H 2 O 2

Question 6

Oxygen has a positive oxidation state in

Accepted Answer

F 2 O

Answer

H 2 O 2

Answer

Cl 2 O

Answer

NaOCl

Question 7

Which of the following is an amphoteric oxide?

Accepted Answer

Al 2 O 3

Answer

Na 2 O 2

Answer

MgO

Answer

SO 2

Question 8

Which of the following is a mixed oxide?

Accepted Answer

Pb 3 O 4

Answer

Na 2 O 2

Answer

P 4 O 6

Answer

P 4 O 10

Question 9

The compound that gives off oxygen on moderate heating is

Accepted Answer

Mercuric oxide

Answer

Cupric oxide

Answer

Zinc oxide

Answer

Aluminium oxide

Question 10

The most abundant element on earth's surface is

Accepted Answer

O 2

Answer

Si

Answer

Al

Answer

Fe

Question 11

Oxygen is obtained by heating

Accepted Answer

Ammonium dichromate

Answer

Bleaching powder

Answer

Sodium peroxide

Answer

Potassium dichromate

Question 12

Which of the following substance absorbs oxygen?

Accepted Answer

Alkaline pyrogallol solution

Answer

Conc. H 2 SO 4

Answer

Lime water

Answer

Alkaline CuSO 4 solution

Question 13

What is the product formed when ozone reacts with mercury?

Accepted Answer

HgO

Answer

Hg 2 O 2

Answer

Hg 2 O

Answer

HgO 2

Question 14

Gas used for sterilizing water is

Accepted Answer

O 3

Answer

SO 2

Answer

NO 2

Answer

NH 3

Question 15

Which of the following oxides are basic and amphoteric respectively?

Accepted Answer

MgO, ZnO

Answer

CaO, MgO

Answer

ZnO, CaO

Answer

SiO, ZnO

Question 16

Which of the following oxide is amphoteric?

Accepted Answer

BeO

Answer

Na 2 O

Answer

MgO

Answer

FeO

Question 17

Freon is used as

Accepted Answer

Refrigerant

Answer

Antibiotic

Answer

Antiseptic

Answer

Antichlor

Question 18

When SO 2 reacts with iron

Accepted Answer

FeS is formed

Answer

Fe 2 O 3 is formed

Answer

Fe is oxidized

Answer

Fe is reduced

Question 19

The concentrated H 2 SO 4 is used extensively to prepare other acids because concentrated H 2 SO 4

Accepted Answer

Has a high boiling point

Answer

Is highly ionized

Answer

Is an excellent dehydrating agent

Answer

Has a high density

Question 20

Transition temperature for 'α' and β-sulphur is

Accepted Answer

96°C

Answer

101°C

Answer

95°C

Answer

92°C

Question 21

Charring of sugar by conc. H 2 SO 4 is its

Accepted Answer

Dehydrating action

Answer

Oxidizing action

Answer

Reducing action

Answer

Dehydrogenation action

Question 22

When SO 2 is passed through KMnO 4 solution

Accepted Answer

KMnO 4 is reduced

Answer

SO 2 is reduced

Answer

KMnO 4 solution is turned green

Answer

KMnO 4 is oxidized

Question 23

A solution of SO 2 in water reacts with H 2 S precipitating sulphur. Here, SO 2 acts as

Accepted Answer

An oxidizing agent

Answer

A reducing agent

Answer

An acid

Answer

A catalyst

Question 24

When H 2 S is passed through an oxidizing agent like HNO 3 , the product obtained is

Accepted Answer

Colloidal sulphur

Answer

Milk of sulphur

Answer

Monoclinic sulphur

Answer

α-sulphur

Question 25

Bleaching action of SO 2 is due to

Accepted Answer

Reduction

Answer

Oxidation

Answer

Hydrolysis

Answer

Its acidic nature

Question 26

Which of the following is not an ore of sulphur?

Accepted Answer

Malachite

Answer

Galena

Answer

Iron pyrites

Answer

Zinc blende

Question 27

H 2 O is liquid while H 2 S is gas because

Accepted Answer

Of the hydrogen bonding in water molecules

Answer

The molecular weight of H 2 S is greater than that of H 2 O

Answer

Of the electrostatic attraction in H 2 S molecule

Answer

H−O−H bond angle is greater than H−S−H bond angle

Question 28

The formula of fuming sulphuric acid is

Accepted Answer

H 2 S 2 O 7

Answer

H 2 SO 4

Answer

H 2 SO 3

Answer

H 2 SO 5

Question 29

Which of the following reagent is used to test sulphate ion of the salt?

Accepted Answer

Barium chloride

Answer

Silver nitrate

Answer

Mercurous nitrate

Answer

Dilute hydrochloric acid

Question 30

Which of the following act as both oxidizing and reducing agent?

Accepted Answer

H 2 SO 3

Answer

H 2 S

Answer

H 2 SO 4

Answer

HNO 3

Question 31

Which of the following gas changes lead acetate paper black?

Accepted Answer

H 2 S

Answer

H 2 SO 4

Answer

SO 2

Answer

SO 3

Question 32

In Contact process the arsenic impurity is removed by

Accepted Answer

Fe(OH) 3

Answer

Pt

Answer

V 2 O 5

Answer

FeO

Question 33

Which of the following allotrope of sulphur is most stable?

Accepted Answer

Rhombic sulphur

Answer

Monoclinic sulphur

Answer

Milk sulphur

Answer

Plastic sulphur

Question 34

H 2 S is a/an

Accepted Answer

Reducing agent

Answer

Oxidizing agent

Answer

Both oxidizing and reducing agent

Answer

Neither oxidizing nor reducing

Question 35

Which of the following is sulphur molecule?

Accepted Answer

S 8

Answer

S 2

Answer

S 4

Answer

S 6

Question 36

The aqueous solution of H 2 S is

Accepted Answer

Weakly acidic

Answer

Neutral

Answer

Alkaline

Answer

Strongly acidic

Question 37

What is consumed during discharge of lead storage battery?

Accepted Answer

H 2 SO 4

Answer

PbSO 4

Answer

Pb

Answer

H 2 O

Question 38

When a lead battery is discharged

Accepted Answer

H 2 SO 4 consumed

Answer

SO 2 evolved

Answer

PbSO 4 consumed

Answer

Lead formed

Question 39

In lab, SO 2 is prepared by

Accepted Answer

FeS + H 2 SO 4

Answer

S + O 2

Answer

FeS + O 2

Answer

Cu + H 2 SO 4

Question 40

The O.S. of 'S' in H 2 SO 4 is

Accepted Answer

+6

Answer

+4

Answer

+2

Answer

0

28Oxygen family

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