set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following acids is used for etching glass?

a) HF

b) HNO₃

c) H₂SO₄

d) HCl

Question : 2

Consider the following chemicals:

1. Benzene
2. Carbon tetrachloride
3. Sodium carbonate
4. Trichloroethylene

a) 1, 2 and 4 only

b) 2 only

c) 1 only

d) 1, 2, 3 and 4

Question : 3

The smog is essentially caused by the presence of

a) O₂ and N₂

b) O₂ and O₃

c) Oxides of sulphur and nitrogen

d) O₃ and N₂

Question : 4

Which one of the following is used as a mordant in dyeing and tanning industry?

a) Magnesium chloride

b) Magnesium carbonate

c) Magnesium oxide

d) Magnesium sulphate

Question : 5

Presence of which of the following fuel gas in the exhaust fumes shows incomplete combustion of fuel?

a) Carbon monoxide and water vapour

b) Sulphur dioxide

c) Carbon monoxide

d) Nitrogen dioxide

Question : 6

What is the role of ultraviolet (UV) radiation in the water purification system?

1. It inactivates / kills the harmful micro-organisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles and improves the clarity of water.

a) 2 and 3 only

b) 1 only

c) 1 and 3 only

d) 1, 2 and 3