• question_answer The oxidation potentials of Zn, Cu, Ag, ${{H}_{2}}$ and Ni are 0.76, -0.34, -0.80, 0 and 0.25 volt respectively. Which of the following reactions will provide maximum voltage? A) $Zn+C{{u}^{2+}}\,\to \,\,Cu+Z{{n}^{\text{2+}}}$B) $~Zn+2A{{g}^{+}}\to \text{ }2Ag+Z{{n}^{2+}}$C) ${{H}_{2}}+C{{u}^{2+}}\to \,\,2{{H}^{+}}+Cu$D) ${{H}_{2}}+N{{i}^{2+}}\to 2{{H}^{+}}+Ni$

$When\text{ }E{{{}^\circ }_{cathode}}-E{{{}^\circ }_{anode}}\,is\,\,maximum$