Consider the following relations for emf of a electrochemical cell (A) Emf of cell = (oxidation potential of…

Consider the following relations for emf of a electrochemical cell (A) Emf of cell = (oxidation potential of anode) - (reduction potential of cathode) (B) Emf of cell = (oxidation potential of anode) + (reduction potential of cathode) (C) Emf of cell = (reduction potential of anode) + (reduction potential of cathode) (D) Emf of cell = (oxidation potential of anode)-(Oxidation potential of cathode) Which of the above relations are correct?
  1. (C) and (A)
  2. (A) and (B)
  3. (C) and (D)
  4. (B) and (D)

Solution

$\begin{aligned}
& \mathrm{E}_{\text {cell }}=\underset{\text { cathode }}{D}-\underset{\text { (red) }}{\mathrm{E}_{\text {anode }}^{\circ}} \\
& \text {or } E_{\text {cell }}=\underset{\text { cred) }}{\mathrm{\mathrm{E}}_{\text {cathode }}^{\circ}}+\underset{\text { (oxide) }}{E_{\text {Anode }}^{\circ}} \\
& \text {or } \mathrm{E}_{\text {cell }}=\underset{\text { (oxide) }}{\mathrm{E}} \underset{\text { anode }}{\mathrm{E}}-\mathrm{E}_{\text {cathode }}^{\circ} \text { (oxide) }
\end{aligned}$

Asked in: NEET 2010 (Mains)

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