set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The main constituent of vinegar is

a) Citric acid

b) Acetic acid

c) Ascorbic acid

d) Tartaric acid

Question : 2

What happens when a fixed amount of oxygen gas is taken in a cylinder and compressed at constant temperature?

1. Number of collisions of oxygen molecules at per unit area of the wall of the cylinder increase.
2. Oxygen ($O_2$) gets converted into ozone ($O_3$).
3. Kinetic energy of the molecules of oxygen gas increases.

a) C only

b) A and C

c) B and C

d) A only

Question : 3

Aqua-regia used by alchemists to separate silver and gold is a mixture of

a) nitric acid (concentrated) and sulphuric acid (concentrated)

b) hydrochloric acid (concentrated) and nitric acid (concentrated)

c) hydrochloric acid (concentrated) and sulphuric acid (concentrated)

d) hydrochloric acid (dilute) and sulphuric acid (dilute)

Question : 4

Which one is a sublime substance?

a) Iodine

b) Table salt

c) Sugar

d) Potassium Iodide

Question : 5

Distillation is a good separation technique for

a) solid alloys

b) liquids

c) solids

d) gases

Question : 6

The chemical name of lime stone is

a) Calcium carbonate

b) Calcium chloride

c) Calcium oxide

d) Calcium