Explore topic-wise MCQs in Chemistry.

This section includes 259 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

Which one is not metal?

A. Sulphur
B. Sugar
C. Nitrogen
D. All of these
Answer» E.
2.

Which one among the following does not have an allotrope ?

A. Oxygen
B. Sulphur
C. Nitrogen
D. Carbon
Answer» D. Carbon
3.

Which of the following oxides is amphoteric in nature

A. CO
B. SiO
C. SnO
D. CaO
Answer» D. CaO
4.

Which gas is evolved when H2O2 reacts with chlorine ?

A. H
B. O
C. CIO
D. None of these
Answer» C. CIO
5.

Which of the following is a true peroxide ?

A. NO
B. MnO
C. BaO
D. SO
Answer» D. SO
6.

The oxidation number of carbon in CH2O is

A. Zero
B. -2
C. +2
D. -4
Answer» B. -2
7.

Decomposition od H2O2 is favoured by

A. MnO
B. Acetanilide
C. Traces of acid
D. All of them
Answer» B. Acetanilide
8.

Which one is true peroxide ?

A. PbO
B. MnO
C. CO
D. H
E. O
Answer» E. O
9.

Bleaching action of chlorine is due to the formation of

A. HCI
B. H
C. HCIO
D. CI
E. O
Answer» D. CI
10.

Bleaching powder is obtained by the action of chlorine gas and

A. Dry CO
B. Dil. solution of Ca(OH)
C. Dry slaked lime
D. Conc. solution Ca(OH)
Answer» D. Conc. solution Ca(OH)
11.

When water is electrolysed, then which of the following is formed ?

A. D
B. O
C. O
D. H
E. Both (b) and (c)
Answer» E. Both (b) and (c)
12.

Which of the following is formed by strong heating of potassium permanganate

A. O
B. Mn
C. H
D. None of these
Answer» B. Mn
13.

Na2O is

A. An acidic oxide
B. An amphoteric oxide
C. A basic oxide
D. A natural oxide
Answer» D. A natural oxide
14.

Which of the following is a pseudohalide ?

A. ICI
B. I
C. CN
D. IF
Answer» D. IF
15.

When CO2 is passed through an aqueous solution of bleaching powder, the gas evolved is

A. Chlorine
B. Oxygen
C. Ozone
D. Chlorine dioxide
Answer» B. Oxygen
16.

The number of unpaired electrons is O2 molecule is

A. 0
B. 1
C. 2
D. None of these
Answer» C. 2
17.

Living in the atmosphere of CO is dangerous because it

A. reduces organic matter of tissues
B. dries up the blood
C. combined with O
D. present inside the form CO
E. combines with heamoglobin and makes it incapable of absorbing oxygen
Answer» E. combines with heamoglobin and makes it incapable of absorbing oxygen
18.

The percentage by weidht of hydrogen in H2O2 is

A. 6.50
B. 5.68
C. 25
D. 50
Answer» C. 25
19.

The fusion product of tritium is

A. H
B. He
C. H
D. He
Answer» E.
20.

Poisonous gas present in fumes of motor car is

A. CH
B. C
C. H
D. CO
E. CO
Answer» D. CO
21.

H3BO3 is

A. Monobasic and weak bronsted acid
B. Monobasic and strong Lewis acid
C. Tribasic and weak bronsted acid
D. None of these
Answer» D. None of these
22.

Which of the following least bond dissociation energy ?

A. Cl
B. Br
C. I
D. F
E. 1
Answer» D. F
23.

Which one of the following is present in Teflon ?

A. F
B. CI
C. Br
D. I
Answer» B. CI
24.

Bleaching powder is obtained by treating Cl2 with

A. Ca(OH)
B. CaCO
C. CaCOCI
D. CaO
Answer» B. CaCO
25.

In manufacture of glass the addition of MnO2 gives

A. Yellow colur
B. Red colour
C. Violet colour
D. Pink colour
Answer» E.
26.

PH3 is an example of

A. Ionic hydride
B. Covalent hydride
C. Metalic hydride
D. Polymeric hydride
Answer» C. Metalic hydride
27.

Which has covalent polymeric structure ?

A. BeH
B. MgH
C. CsH
D. Both (a) and (b)
Answer» E.
28.

Which of the following undergoes sublimation

A. NH
B. Cl
C. CuCl
D. AgCl
E. ZnCl
Answer» B. Cl
29.

Marsh gas contains

A. CO
B. CH
C. N
D. C
E. H
Answer» C. N
30.

Ozone is easily detected by use by

A. Ag
B. Hg
C. AgCl
D. H
E. O
Answer» C. AgCl
31.

A gas that can not be collected over water is

A. N
B. O
C. SO
D. PH
Answer» D. PH
32.

Bleaching action of SO2 is due to

A. Oxidation
B. Reduction
C. Hydrolysis
D. Electrolysis
Answer» C. Hydrolysis
33.

SO2 is not a

A. Basic oxide
B. Bleaching agent
C. Disinfectant
D. Reducing agent
Answer» B. Bleaching agent
34.

Which one is the formula of bleaching powder ?

A. CaCI
B. CaO
C. CI
D. CaOCI
E. CA(OCI)
Answer» D. CaOCI
35.

Bleaching powder is obtained by the interaction of CI2 and

A. Dilute solution of Ca(OH)
B. Dry CaO
C. Conc. solution of Ca(OH)
D. Dry slaked lime
Answer» E.
36.

Which one of the following is the strongest base ?

A. AsH
B. SbH
C. PH
D. NH
Answer» E.
37.

The following compound reacts with conc. H2SO4 to give CO2 gas

A. Formic acid
B. sugar
C. Oxalic acid
D. Ethanol
Answer» D. Ethanol
38.

A colourless gas with smell of rotton fish is

A. SO
B. PH
C. SO
D. O
Answer» C. SO
39.

The mixture of concentrated HCI and HNO3 made in 3 : 1 ratio contains

A. N
B. O
C. NOCI
D. NCI
E. CIO
Answer» D. NCI
40.

The correct acidic strength is

A. HF
B. HCI
C. HBr,HCI
D. HI
Answer» B. HCI
41.

The Cp/Cv value of argon is

A. 1.66
B. 1.55
C. 1.44
D. 1.33
Answer» B. 1.55
42.

Which of the following is a pseudohalgen ?

A. ICI
B. ICI
C. (CN)
D. I
Answer» D. I
43.

Which of the following is interhalogen ?

A. IF
B. I
C. CN
D. (CN)
Answer» B. I
44.

A colourless gas with smell of rotten egg is

A. SO
B. SO
C. H
D. S
E. None
Answer» D. S
45.

The oxidation state of oxygen in O2F2 is

A. +1
B. -2
C. +2
D. +4
Answer» B. -2
46.

Bleaching action of SO2 is due to its

A. Oxidizing action
B. Reducing action
C. Ability to hydrolyse
D. Acidic nature
Answer» C. Ability to hydrolyse
47.

Match the following
List-IList-II
I. Synthesis of ammonia(A)Haber process
II. Purification of titanium(B)Van Arkel method
III. Manufacture of caustic soda(C)Castner-kellner process
IV. Purification of bauxite(D)Mona's process
(E)Solvay's process
(F)Hoop's process
Code
A.I-A, II-B, III-C, IV-F
B.I-B, II-C, III-E, IV-A
C.I-C, II-F, III-D, IC-B
D.I-A, II-B, III-F, IV-D

A. A.
B. B.
C. C.
D. D.
Answer» B. B.
48.

Which is the following is known is ?

A. NaOCI
B. NaCI
C. HCIO
D. HCIO
Answer» B. NaCI
49.

Which of the following does not have bleaching action ?

A. CI
B. (moist)
C. CaOCI
D. NaCIO
E. Br
Answer» E. Br
50.

The compound used as refrigerant is

A. CF
B. CCI
C. CCI
D. F
E. COCI
Answer» D. F