${\mathrm{E}}_1, {\mathrm{E}}_2$ and ${\mathrm{E}}_3$ are the emf of the following three galvanic cells respectively

(i) $\mathrm{Zn}\left(\mathrm{s}\right)\left|{\mathrm{Zn}}^{2+}\left(0.1 \mathrm{M}\right)\right|\left|{\mathrm{Cu}}^{2+}\left(1 \mathrm{M}\right)\right|\mathrm{Cu}\left(\mathrm{s}\right)$

(ii) $\mathrm{Zn}\left(\mathrm{s}\right)\left|{\mathrm{Zn}}^{2+}\left(1 \mathrm{M}\right)\right|\left|{\mathrm{Cu}}^{2+}\left(1 \mathrm{M}\right)\right|\mathrm{Cu}\left(\mathrm{s}\right)$

(iii) $\mathrm{Zn}\left(\mathrm{s}\right)\left|{\mathrm{Zn}}^{2+}\left(1 \mathrm{M}\right)\right|\left|{\mathrm{Cu}}^{2+}\left(0.1 \mathrm{M}\right)\right|\mathrm{Cu}\left(\mathrm{s}\right)$

Which of the following is true?

• A

  ${\mathrm{E}}_2>{\mathrm{E}}_1>{\mathrm{E}}_3$
• Correct answer
  B

  ${\mathrm{E}}_1>{\mathrm{E}}_2>{\mathrm{E}}_3$
• C

  ${\mathrm{E}}_3>{\mathrm{E}}_1>{\mathrm{E}}_2$
• D

  ${\mathrm{E}}_3>{\mathrm{E}}_2>{\mathrm{E}}_1$

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