# Which of the following expressions is not correct?

1. A

${\mathrm{\Delta G}}^{\circ }=-{\mathrm{nFE}}^{\circ }$

2. B

${\mathrm{\Delta G}}^{\circ }=-\mathrm{RTln}{\mathrm{K}}_{\mathrm{p}}^{\circ }$

3. C

${\mathrm{E}}^{\circ }=\frac{\mathrm{RT}}{\mathrm{nF}}\mathrm{log}{\mathrm{K}}_{\mathrm{p}}^{\circ }$

4. D

$\mathrm{\Delta G}={\mathrm{\Delta G}}^{\circ }+\mathrm{RTln}{\mathrm{Q}}_{\mathrm{p}}$

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### Solution:

Standard Gibbs Free energy change ${\mathrm{\Delta G}}^{0}$is given by:-

${\mathrm{\Delta G}}^{0}=-{\mathrm{nFE}}^{\circ }$

It  can also be written as,

${\mathrm{\Delta G}}^{\circ }=-\mathrm{RTln}{\mathrm{K}}_{\mathrm{p}}^{\circ }$ or,

$\mathrm{\Delta G}={\mathrm{\Delta G}}^{\circ }+\mathrm{RTln}{\mathrm{Q}}_{\mathrm{p}}$.

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