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)A. 5.91 gB. 3.941 gC. 7.883 gD. 2.645 g

A current of 12 ampere is passed through an electrolytic cell containi

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)A. 5.91 gB. 3.941 gC. 7.883 gD. 2.645 g
Answer» Correct Answer - C `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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