Question

According to Nernst equation, which is not correct if $Q=K_{c}$ :

• A. $E_{\text {cell }}=0$
• B. $\frac{R T}{n F} \ln Q=E_{\text {cell }}^{\circ}$
• C. $K_{c}=e^{\frac{n F E_{\text {cell }}^{\circ}}{R T}}$
• D. $E_{\text {cell }}=E_{\text {cell }}^{\circ}$

Answer 1

Answer: (D)

$E_{\text {cell }}=E_{\text {cell }}^{\circ}-\frac{ RT }{n F } \ln Q$
At equilibrium,
$ E_{\text {cell }}=0 \text { and } Q =K_{ c }$
$\therefore E_{\text{cell}} \neq E_{\text{cell}}^{\circ}$