The time required to coat a metal surface of 80cm2 with 5×10−3cm thick layer of silver (density 1.05g/cm3) by passing a current of 3amp through silver nitrate solution is____________.
A
115sec
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B
125sec
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C
135sec
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D
145sec
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Solution
The correct option is B125sec Mass of silver in coated layer =volume×density =(80×5×10−3)×1.05g =0.42g ∵W=ItE96500 ∴t=W×96500I×E=0.42×965003×108=125.09sec.