One mole of a monoatomic gas is mixed with three moles of a diatomic gas. The molecular specific heat of mixture at constant volume is $\frac{\alpha^{2}}{4} R J / mol\,K$; then the value of $\alpha$ will be $.......$ (Assume that the given diatomic gas has no vibrational mode.)
  • A$2$
  • B$5$
  • C$8$
  • D$3$
JEE MAIN 2022, Medium
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