The largest intermolecular gaps occur in:

1. water
2. iron ball
3. common salt
4. air

A solid:

1. has a definite shape
2. cannot flow
3. cannot be compressed easily
4. all of the above

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.