What happens to gases at very low temperatures?

Answer 1

At very low temperatures the molecules slow down, so that the intermolecular forces (IMF) come into play. This will cause the gases to condense into liquids as the IMF causes the molecules to come together and act as a liquid.

Also note that the assumptions of the ideal gas law fall apart at very low temperatures and the PV=nRT does not hold under those conditions.

Answer 2

Many of them liquefy, and finally they freeze to "ices."