A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following:

Options

A. `DeltaH` is negative while `DeltaS` is positive
B. Both `DeltaH` and `DeltaS` are negative
C. `DeltaH` is positive whele `DeltaS` is negative
D. Both `DeltaH` and `DeltaS` are positive

Answer

D

Explanation

`DeltaG=Deltah-TDeltaS`
For a spontaneous reaction `DeltaG=-ve`
which is possible when both `DeltaH` and `DeltaS` are positive at high temperature and hence the reaction becomes spontaneous.