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A current of 12 ampere is passed through...

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 ?

A

7.883 g

B

3.941 g

C

5.91 g

D

2.645 g

Text Solution

Verified by Experts

The correct Answer is:
A
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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