Question

Assertion: A reaction is spontaneous if $E_{cell}$ = +ve.
Reason: For $E_{cell}$ = +ve, $\Delta$G is always -ve.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

For a redox reaction to be spontaneous, the EMF of the cell must be positive.

As, $-\Delta G=n F E_{\text {cell }}$

Therefore, for $E_{\text {cell }}=$ +ve, $\Delta G$ is always negative.