Which of the following shows the strongest cohesive force ?

1. Petrol
2. Oxygen
3. Mercury
4. Hydrogen

Classify the following into solids, liquids and gases.

Oxygen, milk, common salt, wax, stone, L.P.G., carbon dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.

What are molecules ?

Define:

(a) Intermolecular force of attraction.

(b) Intermolecular space.

(c) Cohesive force

(d) Diffusion

(e) Brownian movement