Question

When does a gas deviate the most from its ideal behaviour ?

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

Answer 1

Answer: (C)

At high pressure and low temperature

Answer 2

At high pressure and low temperature, gaseous atoms or molecules get closer to each other and van der Waal forces operates. So molecules or atoms start attracting each other. Hence a gas deviate the most from its ideal behaviour. While in ideal behaviour we consider that gases do not attract each, i.e., there is no intermolecular forces of attraction.