JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    The change in entropy of 2 moles of an ideal gas upon isothermal expansion at 243.6 K from 20 L until the pressure becomes 1 atm is

    A)  \[1.385\,\,cal/K\]           

    B)  \[-1.2\,\,cal/K\]

    C)  \[1.2\,cal/K\]                   

    D)  \[2.77\,cal/K\]

    Correct Answer: D

    Solution :

     \[\therefore \] \[\frac{D'-D}{D}=\frac{p}{B}\] \[=\frac{p}{B}\] \[v=\sqrt{2gd}\] \[R=\sqrt{\frac{2h}{g}}\] = 2. 77 cal/K


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