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Three faradays of electricity are passed...

Three faradays of electricity are passed through molten `Al_2O_3`,aqueous solution of `CuSO_4` and molten NaCl taken in different electrolytic cells. Calculate the molar ratio of Al, Cu and Na deposit at the cathodes .

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3 Faraday of electricity are passed through molten Al_2O_3 , aqueous solution of CuSO_4 and molten Nacl taken in three different electrolytic cells. The amount of Al, cu and Na deposited at the cathodes will be in the ratio of :

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