State three properties of molecules of matter.

What is meant by inter-molecular forces of attraction? How do they vary in solids, liquids and gases?

What do you mean by inter-molecular spaces? How do they vary in different states of matter?

Which of the following are correct?

(a) Solids have definite shape and definite volume.

(b) Liquids have definite volume but no definite shape.

(c) Gases have definite volume but no definite shape.

(d) Liquids have both definite shape and definite volume.