The occurrence of a reaction is impossible if

Options

A. `Delta H" is + ve, "Delta S` is also +ve
B. `Delta H" is - ve, "Delta S` is also -ve
C. `Delta H" is -ve, "Delta S` is +ve
D. `Delta H" is +ve, "Delta S` is -ve

Answer

D

Explanation

Positive `Delta H and - Delta S` both oppose the reaction.