1.

ZnAmalgan is prepated by electrolysis of aqueous ZnCl_(2) using Hg catode (9gm). Current is passed through ZnCl_(2) solution for 1000 seconds to prepare a Zn Amalam with 25%Zn by wt. (Zn=65.4)

Answer»

Current off `8.85` amp is passed in the process.
Current of `5.65` amp is passed in the process
Mass of `Zn` in Amalgam is `3gm`
Mass of `Zn` in Amalgam is `6gm`.

Solution :Let `x` gm of `Zn` DEPOSIT of `9gm` of `Hg`
`%` of `Zn` in Amalgam`=(m_(Zn)XX100)/(m_(Zn)xxm_(Hg))=x/(9+x)xx100=25`
`:.x=3gm`
EQ. of `Zn=(3xx2)/(65.4)`
`(n_(Zn))/1=(n_(e^(-)))/2=Q/(2f)=("it")/(2f)`
Current `i=6/(65.4)xx96500/1000=8.85amp.`


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