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How long a current of 3A has to be passe...

How long a current of `3A` has to be passed through a solution of silver nitrate to coat a metal surface of `80cm^(2)` with a `0.005-mm-` thick layer ? The density of silver is `10.5g cm^(-3)`.

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Volume Of Ag coating `=80 cm^(2)xx0.005/10cm =0.04 cm^(3)`
`implies` mass of Ag coating `=0.4xx1.5g=0.42 g`
`implies` gram equivalents of `Ag=0.42/108=` number of Faraday's `implies0.42/108xx96500C3xximplies t=125s`
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