set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

Cloud or fog is an example of colloidal system of

a) solid dispersed in gas

b) gas dispersed in gas

c) liquid dispersed in gas

d) solid dispersed in liquid

Question : 4

Which one of the following will result in the formation of a mixture?

a) Adding sodium metal to water

b) Breaking of ice cubes into small pieces

c) Crushing of a marble tile into small particles

d) Adding milk in water

Question : 5

Which one is a sublime substance?

a) Iodine

b) Table salt

c) Sugar

d) Potassium Iodide

Question : 6

Distillation is a good separation technique for

a) solid alloys

b) liquids

c) solids

d) gases