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w = Zit / 96500. Equivalent weight of cobalt (II) = 59/2, I = 10 A, Time (t) = 109 min = 109 × 60 sec. Substituting the values we get, w = 59 × 10 × 109 × 60 / 2 × 96500 = 20.0.

1. w = 20.0
2. Equivalent weight = 59/2
3. I = 10 A
4. t = 109 min

Correct answer: w = 20.0

Solution

The calculation provided in the question is correct, and the result for w is indeed 20.0. This matches option A.

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