Question

For an ideal gas, the activity co-efficient is

• A. Directly proportional to pressure
• B. Inversely proportional to pressure
• C. Unity at all pressures
• D. Zero at all pressures

Hint:

For ideal gases and ideal solutions, \( \gamma = 1 \), simplifying many thermodynamic expressions.

Answer 1

The Correct Option is C

In an ideal gas, activity coefficient \( \gamma = 1 \).
This means the chemical potential depends only on partial pressure, not on interactions.