1.

`Zn` Amalgan 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)`A. Current off `8.85` amp is passed in the process.B. Current of `5.65` amp is passed in the processC. Mass of `Zn` in Amalgam is `3gm`D. Mass of `Zn` in Amalgam is `6gm`.

Answer» Correct Answer - A::C::D
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.`


Discussion

No Comment Found

Related InterviewSolutions