Question

A gas is said to behave like an ideal gas when
the relation PV/T = constant. When do you
expect a real gas to behave like an ideal gas ?
(a) When the temperature is low
(b) When both the temperature and pressure are low
(c) When both the temperature and pressure are high
(d) When the temperature is high and pressure is low

Answer 1

(d) When the temperature is high and pressure is low

Explanation:

Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure, as the potential energy due to inter molecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.

Hence option D is the correct answer.