Chemistry MCQs

Question 1

The smog is essentially caused by the presence of

Accepted Answer

Oxides of N and S

Answer

O 3 and N 2

Answer

O 2 and N 2

Answer

O 2 and O 3

Question 2

Major gaseous pollutant of the thermal power station is

Accepted Answer

SO 2

Answer

H 2 S

Answer

NH 3

Answer

NO 2

Question 3

Match the sourc in Column B with the product of Column A. (Product) Column B (Source) A. Formic acid 1. Lemon B. Citric acid 2. Tamarind C. Tartaric acid 3. Ants

Accepted Answer

A B C 3 1 2

Answer

A B C 3 2 1

Answer

A B C 2 3 1

Answer

A B C 2 1 3

Question 4

Stalactites and Stalagmites form due to the precipitation of :

Accepted Answer

CaCO 3

Answer

CaCl 2

Answer

MgCl 2

Answer

MgCO 3

Question 5

KMnO 4 can be used as a/an

Accepted Answer

Disinfectant

Answer

Insecticide

Answer

Fertiliser

Answer

Pesticide

Question 6

Basicity of boric acid, H 3 BO 3 is

Accepted Answer

3

Answer

2

Answer

4

Answer

5

Question 7

The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

Accepted Answer

6.023 x 10 19

Answer

1.568 x 10 3

Answer

4.84 x 10 17

Answer

6.023 x 10 23

Question 8

The chemical formula of the laughing gas is

Accepted Answer

N 2 O

Answer

NO

Answer

NO 2

Answer

N 2 O 3

Question 9

Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

Accepted Answer

CO

Answer

CO 2

Answer

O 3

Answer

All of these

Column A. (Product)	Column B (Source)
A. Formic acid	1. Lemon
B. Citric acid	2. Tamarind
C. Tartaric acid	3. Ants