1.

Zn amalgam is prepared by electrolysis of aqueous ZnCl_(2) using Hg cathode (9gm) How much current is to be passed through ZnCl_(2) solution for 1000 seconds to prepare a Zn amalgam with 25% Zn by wt. (Zn=65.4)

Answer»

5.6 amp
7.2 amp
8.85 amp
11.2 amp

Solution :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`


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