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7. In electrolytic refining of copper, when 9.65A of current is passed through an electrolytic cell for 30000 seconds to purify 100g of an impure

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7. In electrolytic refining of copper, when 9.65A of current is passed through an electrolytic cell for 30000 seconds to purify 100g of an impure copper metal at the cathode. What is % of impurity in metal ( MrCu=63.5) [5] 8. Explain why the voltage required in electrolysis is low [2]

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