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One Faraday of electricity is passed thr...

One Faraday of electricity is passed through molten `Al_2O_3`, aqueous solution of `CuSO_4` and molten NaCl taken in three different electrolyti cells connected in series. The mole ratio of Al, Cu and Na deposited at the respective cathode is

A

`2:3:6`

B

`6:2:3`

C

`6:3:2`

D

`1:2:3`

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