A mixture of one mole of monoatomic gas and one mole of a diatomic gas (rigid) are kept at room temperature $\left(27^{\circ} \mathrm{C}\right)$. The ratio of specific heat of gases at constant volume respectively is:
  • A$\frac{7}{5}$
  • B $\frac{3}{2}$
  • C$\frac{3}{5}$
  • D$\frac{5}{3}$
JEE MAIN 2024, Diffcult
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