$P-V$ plots for two gases during adiabatic process are shown in the figure. Plots $1$ and $2$ should correspond respectively to
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(b) In adiabatic process, slope of $PV-$graph.

$\frac{{dP}}{{dV}} = - \gamma \frac{P}{V}$==> |Slope| $\propto \gamma$

From the given graph $(Slope)_2 > (Slope)_1$ ==> ${\gamma _2} > {\gamma _1}$ 

therefore $1$ should correspond to $O_2 (\gamma$ = 1.4) and $2$ should correspond to $He$ ($\gamma = 1.66$)

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