Why h and he can t be liquified by linde method of liquefication?

Answer 1

HYDROGEN & He cant be liuefied because their atomic Masses are small .

second reason is that intramolecular forces are not present in helium and they cannot form covalentbond London forces are weak then inter molecular forces so less energy is required to overcome these forces and gas cannot be cooled.

Answer 2

Because the inter molecular forces and their size both are so small