Q. The molar heat capacity at constant volume of oxygen gas at STP is nearly $\frac{5R}{2}$ and it approaches $\frac{7R}{2}$ as the temperature is increased. This happens because at higher temperature
A) Oxygen becomes triatomic
B) Oxygen does not behaves as an ideal gas
C) Oxygen molecules rotate more vigorously
D) Oxygen molecules start vibrating
Explanation
The correct answer is Option D: Oxygen molecules start vibrating.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.