A) \[400K\]
B) \[300K\]
C) \[500K\]
D) None of these
Correct Answer: C
Solution :
For\[A\xrightarrow{{}}B\]. This reaction is spontaneous, so \[\Delta G\]should be negative but for temperature \[400K\]and\[300K\], \[\Delta G\] value would not be negative and hence will not be spontaneous. \[A\xrightarrow{{}}B\] \[\Delta H=4\,\,kcal\,\,mo{{l}^{-1}}=4000\,\,cal\,\,mo{{l}^{-1}}\] \[\Delta S=10\,\,cal\,\,mo{{l}^{-1}}{{K}^{-1}}\] \[\Delta G=\Delta H-T\Delta S=400-500\times 10\] \[=4000-5000=-1000\] for\[500K\], \[\Delta G\] will be negative and hence it will be spontaneous process.
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