Given that,
$N i^{2 +} / N i = 0.25 V, C u^{2 +} / C u = 0.34 V$
$A g^{+} / A g = 0.80 V$ and $Z n^{2 +} / Z n = - 0.76 V$
Which of the following reactions under standard condition will not take place in the specified direction?

N i^{2 +} (a q .) + C u (s) \to N i (s) + C u^{2 +} (a q .)

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C u (s) + 2 A g^{+} (a q .) \to C u^{2 +} (a q .) + 2 A g (s)

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C u (s) + 2 H^{+} (a q .) \to C u^{2 +} (a q .) + H_{2} (g)

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Z n (s) + 2 H^{+} (a q .) \to Z n^{2 +} (a q .) + 3 H_{2} (g)

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Solution

The correct options are
A $N i^{2 +} (a q .) + C u (s) \to N i (s) + C u^{2 +} (a q .)$
D $C u (s) + 2 H^{+} (a q .) \to C u^{2 +} (a q .) + H_{2} (g)$
$\to$ Reduction potential of $N i^{2 +}$ is less than $C u_{(s)}$ . Hence, reduction of $N i^{2 +}$ will not take place and it will not form $N i_{(s)}$ in given reaction. So, reaction A not possible.
$\to$ Copper is not reactive enough to displace hydrogen ions from solution. Hence, reaction C is not possible in specified direction.

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Similar questions

E_{C e l l}^{o}

Z n (s) + C u^{2 +} (a q) \to Z n^{2 +} (a q) + C u (s)

E_{C u^{2 +} / C u}^{\circ} = 0.34 V, E_{Z n^{2 +} / Z n}^{\circ} = - 0.76 V

E^{\circ}

C u_{(s)} + Z n_{(a q)}^{2 +} \to Z n_{(s)} + C u_{(a q)}^{2 +}

E_{C u^{2 +} / C u}^{0} = 0.34 V, E_{Z n^{2 +} / Z n}^{0} = - 0.76 V

C u (s) | C u^{2 +} (a q) | | A g^{+} (a q) | A g (s)

Z n (s) / Z n^{2 +} (a q) ∥ C u^{2 +} (a q) / C u (s)

{E^{0}}_{{Z n}^{2 +} / Z n} =

-

{E^{0}}_{{C u}^{2 +} / C u} =

+

{E^{0}}_{c e l l}

K

C u (s) | C u^{2 +} (a q) | | A g^{+} (a q) | A g (s)

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