One mole of monatomic gas and three moles of diatomic gas are put together in a container. The molar specific heat (in $JK ^{-1} mol ^{-1}$ ) at constant volume is (Let $R=8 \,JK ^{-1} mol ^{-1}$ )
  • A$18$
  • B$19$
  • C$20$
  • D$21$
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