1.

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 amp is [At., mass of Ca = 40]

Answer»

8
80
10
16

Solution :`w = Z xx IXX t`
`30 = (Eq. wt)/(96500) xx 5 xx t`
Eq. wt = `(40)/(2) "" [CA^(2+) + 2 e^(-) to Ca]`
`30 = (40)/(2 xx 96500) xx 5 xx t`
`t = (30 xx 2 xx 96500)/( 40 xx 5)`
`t = 28950 s = (28950)/(3600) = 8` HOURS


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