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Given that
$E_{N i^{2 +} / N i}^{0} = - 0.25 V; E_{C u^{+ 2} / C u}^{0} = + 0.34 V E_{A g^{+} / A g}^{0} = + 0.80 V; E_{Z n^{+ 2} / Z n}^{0} = - 0.76 V$

Which of the following redox process will not take place in specified direction

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$Z n (s) + 2 H^{+} (a q) \to_{}^{} Z n^{+ 2} (a q) + H_{2} (g)$

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

$N i_{(a q)}^{+ 2} + C u (s) \to_{}^{} N i (s) + C u^{+ 2} (a q)$

$C u (s) + 2 A g^{+} (a q) \to_{}^{} C u^{+ 2} (a q) + 2 A g (s)$

answer is A, C.

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Detailed Solution

A and C are non spontaneous reactions.

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