Calculate standard potential of a cell having electrode reaction as $\begin{aligned} &…

Calculate standard potential of a cell having electrode reaction as $\begin{aligned} & \mathrm{Cd}_{(\mathrm{aq})}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Cd}_{\mathrm{s}} \mathrm{E}^{\circ}=-0.403 \mathrm{~V} \\ & \mathrm{Zn}_{(\mathrm{aq})}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Zn}_{(\mathrm{s})} \mathrm{E}^{\circ}=-0.763 \mathrm{~V} \end{aligned}$
  1. 0.201 V
  2. 0.360 V
  3. 0.481 V
  4. 1.166 V

Solution

$\begin{aligned} & \mathrm{E}_{\text {cell }}^{\circ}=\mathrm{E}_{\text {Cathode }}^{\circ}-\mathrm{E}_{\text {Anode }}^{\circ} \\ & =-0.403-(-0.763) \\ & =0.763-0.403 \\ & =0.36 \mathrm{~V}\end{aligned}$

Asked in: MHT CET 2022 (11 Aug Shift 1)

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