What is dry ice? What happens when the pressure under which it is stored is decreased to $1$ atmosphere?

$(a)$ Arrange the following in the increasing order of $(i)$ Force of attraction $(ii)$ Intermolecular space: Iron nail,Kerosene,and Oxygen gas. $(b)$ Define the following terms: $(i)$ Rigidity $(ii)$ Compressibility $(iii)$ Diffusion.

List any two properties that liquids have in common with gases.

Name the states of matter that:
$(a)$ have a definite shape,volume,and mass.
$(b)$ have the minimum force of attraction between the particles.
$(c)$ have the maximum force of attraction between the particles.

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

In which of the following conditions,the distance between the molecules of hydrogen gas would increase?
$(i)$ Increasing pressure on hydrogen contained in a closed container
$(ii)$ Some hydrogen gas leaking out of the container
$(iii)$ Increasing the volume of the container of hydrogen gas
$(iv)$ Adding more hydrogen gas to the container without increasing the volume of the container