question_answer

For a given reaction, \[\Delta H=35.5\,kJ\,mo{{l}^{-1}}\] and \[\Delta S=83.6\,J{{K}^{-1}}\,mo{{l}^{-1}}.\] The reaction is spontaneous at : (Assume that \[\Delta H\] and \[\Delta S\] do not vary with temperature)     [NEET-2017]

A)  \[T>298\text{ }K\]       

B)       \[T<425\text{ }K\]

C)  \[T>425\,K\]    

D)       All temperatures

Correct Answer: C

Solution :

[c]

For a reaction to be spontaneous,

i.e.,

i.e., T > 425 K