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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2007

  • question_answer
    Two balloons are filled, one with pure He gas and the other by air, respectively. If the pressure and temperature of these balloons are same then the number of molecules per unit volume is

    A)  more in the He filled balloon

    B)  same in both balloons

    C)  more in air filled balloon

    D)  in the ratio of 1 : 4

    Correct Answer: B

    Solution :

    Ideal gas equation can be written as                 \[pV=nRT\] or            \[\frac{n}{V}=\frac{P}{RT}=\]constant So, at constant pressure and temperature, all gases will contain equal number of molecules per unit volume.


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