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What will be standard cell potential of galvanic cell with the following reaction?
$2 C r_{(s)} + 3 C {d^{2 +}}_{(a q)} \to 2 C {r^{3 +}}_{(a q)} + 3 C d_{(s)}$
$[G i v e n : {E^{o}}_{C r^{3 +} / C r} = - 0.74 V a n d {E^{o}}_{C d^{2 +} / C d} = - 0.40 V]$

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0.74 V

0.34 V

1.14 V

-0.34 V

answer is C.

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Detailed Solution

$E_{c e l l}^{o} = E_{c a t h o d e}^{o} - E_{a n o d e}^{o}$

$E_{c e l l}^{o} = E_{C d^{2 +} / C d}^{o} - E_{C r^{3 +} / C r}^{o}$

= -0.40 – (-0.74) = +0.34 V

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