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How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate ? (Atomic mass of copper =63.5 u $\;N_{A}\;$ = Avogadro's constant) :

$(a)\;\large\frac{N_{A}}{20}\qquad(b)\;\large\frac{N_{A}}{10}\qquad(c)\;\large\frac{N_{A}}{5}\qquad(d)\;\large\frac{N_{A}}{2}$

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