Question

A gas is said to behave like an ideal gas when the relation $\frac{PV}{T}=$ 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 is high
• D. When the temperature is high and pressure is low

Answer 1

The correct option is D When the temperature is high and pressure is low

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 correct answer.