• question_answer P-V plots for two gases during adiabatic processes are shown in the figure. Plots 1 and 2 should correspond respectively to   A)  $He$ and $Ar$                      B)  $He$ and ${{O}_{2}}$C)  ${{O}_{2}}$ and ${{N}_{2}}$               D)   ${{O}_{2}}$ and $He$

In the graph given, slope of curve 2 is greater than the slope of curve 1. ${{\left( \frac{\gamma P}{V} \right)}_{2}}>{{\left( \frac{\gamma P}{V} \right)}_{1}}\Rightarrow {{\gamma }_{2}}>{{\gamma }_{1}}$${{\gamma }_{He}}>{{\gamma }_{{{O}_{2}}}}$ Since, ${{\gamma }_{monoatomic}}>{{\gamma }_{diatomic}}$ Hence, curve 2 corresponds to helium and curve 1 corresponds to oxygen.