Question

Mark the correct relationship from the following :

• A. Equilibrium constant is related to $emf$ as $logK=\frac{nFE}{2.303RT}$
• B. $EMF$ of a cell $Zn\left|Z{n}_{\left(a_1\right)}^{2+}\right|\left|C{u}_{\left(a_2\right)}^{2+}\right|Cu$ is
  $E=E^{\circ }-\frac{0.591}{n}log\frac{\left[a_2\right]}{\left[a_1\right]}$
• C. Nernst equation is
  $E_{cell}=E_{cell}^{\circ }-\frac{0.0591}{n}log\frac{\text{[Products]}}{\text{[Reactants]}}$
• D. For the electrode $M^{n+}/M$ at $273K$
  $E=E^{\circ }+\frac{0.591}{n}log\left[M^{n+}\right]$

Answer 1

Answer: (C)

$\left(a\right)logK=\frac{nF{E}_{cell}^{\circ }}{2.303RT}$
$\left(b\right)E_{cell}=E_{cell}^{\circ }-\frac{0.0591}{2}log\frac{\left[a_1\right]}{\left[a_2\right]}$
$(d)$ Expression is valid at $298K$, not at $273K$.