JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • 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 \[He\]                                   

    Correct Answer: D

    Solution :

     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.


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