A spontaneous reaction is impossible if

Options

A. both `DeltaH` and `Delts S` are negative.
B. both `DeltaH` and `DeltaS` are positive
C. `DeltaH` is negative and `DeltaS` is positive.
D. `Delta H` is positive and `DeltaS` is negative.

Answer

D

Explanation

`DeltaG=DeltaH-TDeltaS, DeltaG` is positive for a reactionn to be non spontaneous when `DeltaH` is positive and `DeltaS` is negative.