$A$ mixture of one mole of monoatomic gas and one mole of a diatomic gas (rigid) is kept at room temperature $\left(27^{\circ} C\right)$. The ratio of the specific heat of these gases at constant volume is:

  • A
    $\frac{7}{5}$
  • B
    $\frac{3}{2}$
  • C
    $\frac{3}{5}$
  • D
    $\frac{5}{3}$

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