Question

A current of 1.70 A is passed through 300.0mL of
0.160M solution at ZnSO4 for 230s with a current
efficiency of 90%. Find out the molarity of Zn2+ after
the deposition of Zn. Assume the volume of the
solution to remain constant during the electrolysis.
[IIT-JEE '91]
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Answer 1

Ans:- 0.154 M

Yur answer is in above attachment mate! :-)