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NEET AIPMT SOLVED PAPER 2002

  • question_answer
                    2 mole of ideal gas at \[{{27}^{\text{o}}}C\] temperature is expanded reversibly from 2 L to 20 L. Find entropy change (R = 2 cal/mol K):                                                                                                                                                             

    A)                 92.1       

    B)                 0             

    C)                 4             

    D)                 9.2

    Correct Answer: D

    Solution :

                    \[\Delta S\] (Entropy change) \[=2.303\,\,nR\,\,{{\log }_{10}}\,\frac{{{V}_{2}}}{{{V}_{1}}}\]                 \[=2.303\times 2\times 2\times {{\log }_{10}}\,\frac{20}{2}\]                 \[=2.303\times 2\times 2\times 1\]                 \[=9.212\,cal\] 


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