What is standard reduction potential of $\mathrm{Cu}^{2+} \mid \mathrm{Cu}_{(\mathrm{s})}$ if…

What is standard reduction potential of $\mathrm{Cu}^{2+} \mid \mathrm{Cu}_{(\mathrm{s})}$ if $\mathrm{E}^{\circ}$ of following cell is 0.46 ? $\mathrm{Cu}_{(\mathrm{s})}\left|\mathrm{cu}_{(\mathrm{aq})}^{2+} \| \mathrm{Ag}_{(\mathrm{aq})}^{+}\right| \mathrm{Ag}_{(\mathrm{s})} ; \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}=0.80 \mathrm{v} \mid$
  1. $1.56 \mathrm{~V}$
  2. $0.34 \mathrm{~V}$
  3. $1.44 \mathrm{~V}$
  4. $1.26 \mathrm{~V}$

Solution

$\begin{aligned} & \mathrm{E}_{\text {cell }}^{\circ}=\mathrm{E}_{\mathrm{Ag}}^{\circ}-\mathrm{E}_{\mathrm{cu}}^{\circ} \\ & 0.46=0.80-\mathrm{E}_{\text {cell }}^{\circ} \\ & \mathrm{E}_{\mathrm{cu}}^{\circ}=0.34 \mathrm{v}\end{aligned}$

Asked in: MHT CET 2022 (05 Aug Shift 1)

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