Why is the rate of diffusion faster in the gaseous state?

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends,she got confused. Help her to identify the correct set of conditions.

Which condition out of the following increases the evaporation of water?

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

Fill in the blanks :
$(a)$ Evaporation of a liquid at room temperature leads to a ........... effect.
$(b)$ At room temperature,the forces of attraction between the particles of solid substances are ........... than those which exist in the gaseous state.
$(c)$ The arrangement of particles is less ordered in the ........... state. However,there is no order in the ........... state.
$(d)$ ........... is the change of solid state directly to vapour state without going through the ........... state.
$(e)$ The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ...........

What is meant by evaporation? How is this process different from boiling?