Given that the standard potentials E o of Cu 2 + / Cu and Cu + / Cu are 0.34 V and 0.522 V respectively, the…

1. $0.182\mathrm{}\mathrm{V}$
2. $+0.158\mathrm{}\mathrm{V}$
3. $-0.182\mathrm{}\mathrm{V}$
4. $-0.158\mathrm{}\mathrm{V}$

Solution

$2\times 0.34={\mathrm{E}}_1^{\mathrm{o}}+1\times 0.522$
${\mathrm{E}}_1^{\mathrm{o}}=0.68-0.522$
${\mathrm{E}}_1^{\mathrm{o}}=0.158$

Asked in: JEE Main 2020 (07 Jan Shift 1)

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