What will be the emf for the given cell?
$\mathrm{Pt}\left|{\mathrm{H}}_2\left(\mathrm{g},{\mathrm{P}}_1\right)\right|{\mathrm{H}}^{+}\left(\mathrm{aq}\right)\left|{\mathrm{H}}_2\left(\mathrm{g},{\mathrm{P}}_2\right)\right|\mathrm{Pt}$

• A

  $\frac{\mathrm{RT}}{\mathrm{F}}\ln \frac{{\mathrm{P}}_1}{{\mathrm{P}}_2}$

• B

  $\frac{\mathrm{RT}}{2\mathrm{F}}\ln \frac{{\mathrm{P}}_1}{{\mathrm{P}}_2}$

• C

  $\frac{\mathrm{RT}}{\mathrm{F}}\ln \frac{{\mathrm{P}}_2}{{\mathrm{P}}_1}$

• D

  None of these