Which gas forms liquid first as the air is cooled?

Which gas is present highly in the air ?

The gas that liquefies first, when cooled from 500K to its critical temperature given in parenthesis is

Assertion: The solubility of the gas in a liquid increa ses with increase of pressure. Reason : The solubility of a gas in a liquid is directly proportional to the pressure of the gas.

The animal which holds its feet in the air to cool down from the hot sand is-

Assertion (A) : The process of conversion of liquid water to its vapours by heating the-liquid is called boiling.Reason (R) : The process of conversion of water vapours to liquid by.cooling the vapours is called condensation.

The gas we use in kitchen is in the form of liquid in the cylinder. When it comes out from the cylinder it becomes a gas (step I), then it burns (step II). Choose the correct statement from the following:

The noble gas which behaves abnormally in liquid state is

Which gas is very less in quantity in inhaled air?