Change in State

Q. Give reasons:​

(h) A red ink drop added to a small amount of water in a glass turns the water red sometime.​

Q. Classify the following into solids liquids and gases.​
Oxygen , milk, common salt, wax, stone, LPG gas, carbon dioxide, sugar, mercury, coal, blood, butter, copper, coconut, oil, kerosene.​

Q. Difference between;

(c) Gas and vapour

Q. Which of these occurs due to condensation?

1. The drying of wet clothes.
2. Steam rising from wet clothes when they are ironed.
3. Water drops appearing on the outer surface of a cool water bottle.
4. Blackboard gets dried after it is wiped with a wet cloth.

Q. Which one is a kind of matter ?
(a) light
(b) petroleum
(c) sound
(d) heat

Q. Write whether the following statements are true or false.

(f) The intermolecular force of attraction is the weakest in gases.

1. True
2. False

Q.

Which of the following is not matter?

1. Air

2. Feeling of cold

3. Dust

4. Humidity

Q.

When water evaporates from the water body, the surrounding:

1. Cooler

2. Warmer

3. Remains unaffected

4. Can’t be said

Q.

In which state of matter do the particles move to long distances.

Q.

Purest form of natural water is :

1. spring water

2. rainwater

3. well water

4. sea water

Q. Ice changes into water on .

1. cooling
2. heating
3. freezing

Q. Gases are incompressible.

1. False
2. True

Q.

The adsorption capacity of wood charcoal decreases when it is heated at about $900°\mathrm{C}$.

1. True
2. False

Q.

Which property of the particles of a matter is directly related to the temperature?

1. Energy of the particles do not depend on temperature

2. Average kinetic energy

3. Interparticle repulsion

4. Interparticle space