Question

When a real gas show behaviour same as ideal gas :

• A. At low temperature and low pressure
• B. At high temperature and high pressure
• C. At low temperature and high pressure
• D. At high temperature and low pressure

Answer 1

The correct option is D At high temperature and low pressure

A real gas show behaviour the same as an ideal gas at high temperature and low pressure

At high temperature, $V$ is very large and the terms $a/V^2$ and b can be neglected and the van der waals equation reduces to ideal gases equation $PV=RT$

Hence, at high temperature, the real gases behave like ideal gases.
At extremely low pressures, $V$ is very large and the value of a/v is very small and can be ignored.

The van der waals equation reduces to ideal gases equation $PV=RT$
Hence, at extremely low pressures, the real gases behave like ideal gases.

Hence, the correct option is $\text{D}$