NEET Sample Paper NEET Sample Test Paper-9

  • question_answer One mole of a perfect gas expands isothermally to ten times its original volume. The change in entropy is

    A)  \[0.1\,R\]                    

    B)  \[2.303\text{ }R\]

    C)  \[10.0\text{ }R\]                      

    D)  100.0 R

    Correct Answer: B

    Solution :

    \[{{q}_{rev}}=-{{W}_{rev}}=2.303\,nRT\,\log \frac{{{V}_{2}}}{{{V}_{1}}}\] \[\Delta S=\frac{{{q}_{rev}}}{T}=2.303\,\,n\,R\,\log \frac{{{V}_{2}}}{{{V}_{1}}}\] \[n=1\] \[\frac{{{V}_{2}}}{{{V}_{1}}}=10\] \[\Delta S=2.303\times 1\times R\times \log \,10\] \[=2.303\times R\times 1\] \[=2.303\,R\]


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