Rate of diffusion is faster in gases. Why?

$(a)$ $CO_2$ is a gas. Write its two gaseous properties to justify it.
$(b)$ How can we liquefy a gas?
$(c)$ Solid $CO_2$ is also known as dry ice. Why?
$(d)$ Write the full form of:
$(i)$ $CNG$
$(ii)$ $LPG$

Give the reason for the existence of the three states of matter.

Why do gases show high compressibility?

Which state of matter is found to be more stable at lower temperatures?

Account for the following:
$(a)$ When sugar crystals dissolve in water,the level of water does not rise appreciably.
$(b)$ Doctors advise to put strips of wet cloth on the forehead of a person having high fever.
$(c)$ Naphthalene balls disappear with time without leaving any solid residue.
$(d)$ $A$ wooden table should be called a solid.
$(e)$ Dogs generally hang out their tongue in summer.