| Moleculae type | $\frac{C _{ P }}{ C _{ v }}$ |
| $(A)$ Monoatomic | $(I)$ $\frac{7}{ 5}$ |
| $(B)$ Diatomic rigid molecules | $(II)$ $\frac{9}{7}$ |
| $(C)$ Diatomic non-rigid molecules | $(III)$ $\frac{4}{3}$ |
| $(D)$ Triatomic rigid molecules | $(IV)$ $\frac{5}{3}$ |
| Column $- I$ | Column $- II$ |
| $(A)$ Root mean square speed of gas molecules | $(P)$ $\frac{1}{3} \mathrm{n} m \bar{v}^{2}$ |
| $(B)$ Pressure exerted by ideal gas | $(Q)$ $\sqrt{\frac{3 \mathrm{RT}}{\mathrm{M}}}$ |
| $(C)$ Average kinetic energy of a molecule | $(R)$ $\frac{5}{2} \mathrm{RT}$ |
| $(D)$ Total internal energy of $1$ mole of a diatomic gas | $(S)$ $\frac{3}{2} \mathrm{k}_{\mathrm{B}} \mathrm{T}$ |