Question

Curves A and B describe the log P versus log V relation for helium, hydrogen, O₃ and PH₃ during adiabatic process. Curve C is for

(A) He

(B) H₂

(C) O₃

(D) PH₃

Answer 1

Explanation

(A) He

For an adiabatic process

 = constant

or, log P +γ  logV = constant

log P = -γ log V = constant

Thus the slope of log P versus log V graph is -γ . The value of γ is maximum for helium, a monoatomic gas.

Thus curve C should correspond to helium.