The value of $\gamma\left(=\frac{\mathrm{C}_{\mathrm{p}}}{\mathrm{C}_{\mathrm{v}}}\right),$ for hydrogen, hellium and another ideal diatomic gas $X$(whose molecules are not rigid but have an additional vibrational mode), are respectively equal to 
  • A$\frac{7}{5}, \frac{5}{3}, \frac{9}{7}$
  • B$\frac{5}{3}, \frac{7}{5}, \frac{9}{7}$
  • C$\frac{5}{3}, \frac{7}{5}, \frac{7}{5}$
  • D$\frac{7}{5}, \frac{5}{3}, \frac{7}{5}$
NEET 2019, Medium
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