The specific heat of the mixture of two gases at constant volume is $\frac {13}{6}\,R$ . The ratio of number of moles of first gas to second is $1 : 2$. The respective gases may be
  • A$O_2,\, N_2$
  • B$He,\, Ne$
  • C$He,\,N_2$
  • D$N_2,\,He$
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