The oxidation potential of \( \mathrm{Zn}, \mathrm{Cu}, \mathrm{Ag}, \mathrm{H}_{2} \) and \( \m...

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The oxidation potential of \( \mathrm{Zn}, \mathrm{Cu}, \mathrm{Ag}, \mathrm{H}_{2} \) and \( \mathrm{Ni} \) are \( 0.76,-0.34,-0.80,0,0.55 \) volt respectively. Which of the following reaction will provide maximum voltage?
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