$P-V$ plots for two gases during adiabatic process are shown in the figure. Plots $1$ and $2$ should correspond respectively to

79-8

  • A

    $He$ and ${O_2}$

  • B

    ${O_2}$ and $He$

  • C

    $He$ and $Ar$

  • D

    ${O_2}$ and ${N_2}$

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