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The approximate time duration in hours t...

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]

A

8

B

80

C

10

D

16

Text Solution

Verified by Experts

The correct Answer is:
A
According to Faraday.s first law of electrolysis, `w=Z xx I xx t=("Eq. wt")/(96500) xx I xx t`
Here, `w=30g, I=5A`
Eq. wt. of Ca`=("Atomic wt.")/("Valency")=(40)/(2)=20`
`:.30=(20)/(96500)xx5xxt`
or `t=(96500xx30)/(5xx20)=28950s`
`=(28950)/(60xx60)h=8.04 h`
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