1.

A current of 12 ampere is passed through an electrolytic cell containing aq. 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 ? (At.mass of Ni = 98.7)

Answer»

5.91 G
3.941 g
7.883 g
2.645 g

Solution :`Q= I xx t (s) 12 xx 60 xx 60 = 43200` C .
`Ni^(2+) + 2e^(-) to Ni` .
Theortically, `2 xx 96500` C will deposit Ni = 58.7 g . Hence , 43200 C will deposit Ni = 13.137 g .
As current efficiency is 60 % , MASS actually deposited = `(60)/(100) xx 13.137` = 7.88 g .


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