Zn amalgam is prepared by elctrtolysis of aqueous `ZnCI_(2)` using 9 gram Hg cathode how much current is to be pased through `ZnCI_(2)` solution for 1000 seconds to prepare a Zn amalagam with 25% by weight ? (atomic masss Zn =65.4 g)

Options

A. 5.6 amp
B. 7.2 amp
C. 8.85 amp
D. 11.2 amp

Answer

C

Explanation

let x gm of Zn deposit on 9 gm of Hg
`%` of Zn in amalgam `=(x)/(9+x)xx100=25`
`thereforex=3gm`
Eq of `Zn=(3xx2)/(65.4)`
current `=(6)/(65.4)xx(96500)/(1000)=8.86amp`