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In electro-refining of metal the impure metal is made the anode and a strip of pure metal, the cathode, during the electrolysis of an aqueous solution of a complex metal salt. This method can not be used for refining of

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Aliminium

Silver

Sodium

Copper

answer is D.

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Detailed Solution

Na reacts vigorously with water (exothermic process). The product is NaOH and Hydrogen gas.

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