1.

A current of 12 ampere is passed through an electrolytic cell containing aqueous NiSO_(4) solution. Both Ni and H_2 gas are formed at the cathode. The current efficiency is 60% . What is the mass of nickel deposited on the cathode per hour ?

Answer»

7.883 g
3.941 g
5.91 g
2.645 g

Solution :At cathode`:Ni^(2+) + 2e^(-) rarr Ni`
Now, equivalent weight of `Ni = ("MOLECULAR weight")/("electron GAIN")`
`= (58.7)/(2) =29.35`
GIVEN i = 12 A, t=1 hr `=60 xx 60 sec`
`Z = ("equivalent weight")/("96500")`
Weight of deposited Ni `= ("ZIT" xx "efficiency")/(100)`
`= (29.35 xx 12 xx 60 xx60)/(96500 xx 100) xx 60 = 7.883 g`


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