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  • A reaction will never be spontaneous at any temperature and pressure if:Option: 1 <img alt="\mathrm{\Delta S>0, \Delta H>0}

A reaction will never be spontaneous at any temperature and pressure if:

Option: 1

\mathrm{\Delta S>0, \Delta H>0}


Option: 2

\mathrm{\Delta S<0, \Delta H>0}


Option: 3

\mathrm{\Delta S<0, \Delta H<0}


Option: 4

\mathrm{\Delta S>0, \Delta H<0}


Answers (1)

best_answer

As we learnt,

\mathrm{\Delta G=\Delta H-T\Delta S}

A reaction is spontaneous if \mathrm{\Delta G< 0}.

So for a non-spontaneous reaction we want \mathrm{\Delta G> 0}. Which means if \mathrm{\Delta S< 0}  then \mathrm{\left ( -T\Delta S \right )} will be a positive term.

So if \mathrm{\Delta H} is also positive then the reaction will be non-spontaneous at all temperature and pressure.

Hence, Option number (2) is correct

Posted by

rishi.raj

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