A process will be spontaneous at all temperatures if :-

Question:

A process will be spontaneous at all temperatures if :-

  1. $\Delta \mathrm{H}>0$ and $\Delta \mathrm{S}<0$

  2. $\Delta H<0$ and $\Delta S>0$

  3. $\Delta \mathrm{H}>0$ and $\Delta \mathrm{S}>0$

  4. $\Delta \mathrm{H}<0$ and $\Delta \mathrm{S}<0$

Correct Option: , 2

Solution:

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

for spontaneous process at all temp. $\Delta \mathrm{G}<0$ and it is possible when $\Delta \mathrm{H}<0$ and $\Delta \mathrm{S}>0$.

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