Chemical Thermodynamics Question 396

Question: A reaction is spontaneous at low temperature but non-spontaneous at high temperature. Which of the following is true for the reaction-

Options:

A) $ \Delta H>0,,\Delta S>0 $

B) $ \Delta H<0,\Delta S>0 $

C) $ \Delta H>0,,\Delta S=0 $

D) $ \Delta H<0,,\Delta S<0 $

Show Answer

Answer:

Correct Answer: D

Solution:

  • We know that $ \Delta G=\Delta H-T\Delta S $ When $ \Delta H<0 $ and $ \Delta S<0 $ then $ \Delta G $ will be negative at low temperatures (positive at high temperature) and the reaction will be spontaneous.


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