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

• A

  $\frac{R T}{f} \log \frac{P_1}{P_2}$
• B

  $\frac{R T}{2 f} \log \frac{P_1}{P_2}$
• C

  $\frac{R T}{f} \log \frac{P_2}{P_1}$
• Correct answer
  D

  none of these

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