Q67 / 180 · AIIMS 2011 · Chemistry

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

  • Correct answer
    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.

Solution

For a redox reaction to be spontaneous, the EMF of the cell must be positive. $$ \text { As, }-\Delta G=n F E_{\text {cell }} $$ Therefore, for $E_{\text {cell }}=+$ ve, $\Delta G$ is always negative.

Hence, the correct answer is option: 'A'.

Relevant Questions