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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    2 mol of an ideal gas at \[{{27}^{{}^\circ }}C\]is expanded reversibly from 2 lit to 20 lit. Find entropy change (R = 2cal/mol k)

    A) 92.1                             

    B) 0       

    C) 4                                 

    D) 9.2

    Correct Answer: D

    Solution :

    [d] 9.2 At constant temperature, Entropy charge, \[\Delta s=nRT\,\,\operatorname{In}\frac{{{V}_{2}}}{{{V}_{1}}}\] \[=2.303\,nRT\,\,\log \frac{{{V}_{2}}}{{{V}_{1}}}\] \[=2.303\times 2\times 2\times \,\,\log \frac{20}{2}\] \[=9.2\,cal\,{{k}^{-1}}\,mo{{l}^{-1}}\]


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