Question

A real gas deviates least from ideal behaviour at:

• A. High pressure and low temperature
• B. High temperature and low pressure
• C. High temperature and high pressure
• D. Low temperature and low pressure

Hint:

Real gases show ideal behaviour when:
Temperature is high (attractive forces negligible)
Pressure is low (molecular volume negligible) This condition is often referred to as the \textbf{ideal region}.

Answer 1

The Correct Option is B

Step 1: Ideal gas behaviour assumes:
Negligible intermolecular forces
Negligible volume of gas molecules
Step 2: At high temperature, kinetic energy of gas molecules is very large, so the effect of intermolecular attractions becomes negligible.
Step 3: At low pressure, gas molecules are far apart, so their own volume and intermolecular forces can be ignored.
Step 4: Therefore, under conditions of high temperature and low pressure, a real gas behaves most like an ideal gas.