An electrolytic cell contains alumina. If we have to obtain 50 g Al by using 105 A of current, the time required is

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1.54 hr

2.15 hr

1 .42 hr

1.32 hr

answer is C.

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Detailed Solution

Al3++3e−⟶AlEquivalent weight of Al=273=9From Faraday's first law, w=zIt=E96500It∴ t=w×96500E×I=50×965009×105=5105.82s=1.42hr

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