Intermolecular forces of attraction are least effective in

Name the state of matter in which:
$(a)$ Layers of particles can slip and slide over one another easily.
$(b)$ Particles just move around randomly because of very weak force of attraction.

Distinguish between the three states of matter with respect to the following properties:
$(a)$ Density
$(b)$ Diffusion
$(c)$ Particle motion

Arrange the solids,liquids,and gases in order of:
$(a)$ increasing intermolecular space.
$(b)$ increasing intermolecular force.

Which of the following substances in the gaseous state should be called a vapour?
$(i)$ Helium
$(ii)$ Nitrogen
$(iii)$ Carbon dioxide
$(iv)$ Sulphur

$A$ wooden chair is a solid at room temperature. Give two reasons.