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.
