1.

To thin coat of silver on metal surface of 80cm^(2)xx5xx10^(-3)cm, how long current of 3 ampere should be passed from silver nitrate solution (Density 1.05gm" "cm^(-3)) ?

Answer»

115 SECOND
125 second
135 second
145 second

Solution :Required weight of Ag=`Vxxd`
`=80xx5xx10^(-3)xx1.05`
`W=0.45`
`THEREFORE W=(Exxixxt)/(96500)`
`therefore 0.42=(108xx3xxt)/(96500)`
`=125.09`
`therefore t~~125` second.


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