The diameter of a molecule is approximately :

1. 1 cm
2. 10 cm
3. 10^-10 m
4. 1 m

The molecules :

1. in solid, liquid and gas, move freely anywhere.
2. in a solid, move freely within its boundary.
3. in a liquid, move within its boundary.
4. in a gas, move only within its boundary.

Solids are :

1. more dense
2. less dense
3. least dense
4. highly compressible

The inter-molecular forces in liquids are :

1. as strong as in solids
2. stronger than in solids
3. weaker than in solids
4. weaker than in gases