Question

For a chemical reaction, ∆G will always be negative if:

• A. ∆H and ∆S both are +ve
• B. ∆H and ∆S both are – ve
• C. ∆H is negative and ∆S is positive
• D. ∆H is positive and ∆S is negative

Answer 1

The correct option is C ∆H is negative and ∆S is positive

From gibbs helmholtz relations:
$\Delta G=\Delta H-T\Delta S$
Now for $\Delta G$ to be always negative $\Delta H$ needs to be negative and $\Delta S$ needs to be positive.