Equilibrium constant (K) is related with standard cell potential (${\mathrm{E}}_{\mathrm{cell}}^{\mathrm{o}}$) but not with ${\mathrm{E}}_{\mathrm{cell}}$. This is because

• A

  ${\mathrm{E}}_{\mathrm{cell}}^{\mathrm{o}}$ is easier to calculate as compared to ${\mathrm{E}}_{\mathrm{cell}}$

• B

  ${\mathrm{E}}_{\mathrm{cell}}$ becomes zero at equilibrium but ${\mathrm{E}}_{\mathrm{cell}}^{\mathrm{o}}$ does not

• C

  At a given temperature, ${\mathrm{E}}_{\mathrm{cell}}$ changes hence, values of K cannot be measured

• D

  K also relates with ${\mathrm{E}}_{\mathrm{cell}}$.