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A current of 3 ampere has to be passed t...

A current of 3 ampere has to be passed through a solution of `AgNO_(3)` solution to coat a metal surface of `80 cm^(2)` with 0.005 mm thick layer for a duration of approximately `y^(3)` second what is the value of y?
Density of Ag is 10.5 `g//cm^(3)`

A

115 sec

B

124 sec

C

135 sec

D

145 sec

Text Solution

Verified by Experts

The correct Answer is:
B
Weight of Ag required = `V xx d`
`= 80 xx 5 xx 10^(-3) xx 1.05 = 0.42`
`because W = ("Eit")/(96500) `
`therefore 0.42 = (108 xx 3 xx t)/(96500) implies t = 125` sec .
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