Match List I with List II.
$$\begin{array}{|l|l|l|l|}\hline & \text{List I} & & \text{List II} \\ \hline \text{A.} & \text{3 translational degrees of freedom} & \text{I.} & \text{Monoatomic gases} \\ \hline \text{B.} & \text{3 translational, 2 rotational degrees of freedom} & \text{II.} & \text{Polyatomic gases} \\ \hline \text{C.} & \text{3 translational, 2 rotational and 1 vibrational degrees of freedom} & \text{III.} & \text{Rigid diatomic gases} \\ \hline \text{D.} & \text{3 translational, 3 rotational and more than one vibrational degrees of freedom} & \text{IV.} & \text{Nonrigid diatomic gases} \\ \hline \end{array}$$
Choose the correct answer from the options given below:
Answer: (A) A-I, B-III, C-IV, D-II
Monoatomic: translation only (A-I). Rigid diatomic: 3 + 2 (B-III). Non-rigid diatomic adds one vibrational mode (C-IV). Polyatomic: 3 rotational and several vibrational modes (D-II).
Solution by Sreeraj P, M.Sc Physics