Question

when the pressure approaches zero why do the real gases behave like ideal gases?

Answer 1

Molecular interactions operate between the molecules of the real gas at normal pressure condition as, when the molecules get less space for movement at high pressures, due to individual volume of the molecules. This affects the actual pressure of the gas on the walls of the container. The molecules do not collide with walls, with full force because they are dragged back by other molecules due to intermolecular interactions. Thus, as pressure is lowered, the molecular interactions decrease and the real gas start approaching the behaviour of ideal gas.