A metal surface of 100 cm2 area has to be coated with nickel layer of thickness 0.001 mm. A current of 2A was passed through a solution of Ni(NO3)2 for ‘x’ seconds to coat the desired layer. The value of x is ____ (Nearest integer)
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Solution
$\begin{aligned} & \text { Sol. } \quad \text { W }=z \times i \times t \\ & \text { Density × volume } \left.=\frac{E \times i \times t}{96500} \right\rvert\, \\ & 10 \times 100 \times 0.0001=\frac{\left(\frac{\text { atomic wt. }}{v . f}\right) \times 2 \times x}{96500}(v, f=2) \\ & \therefore x=161 \text { sec. }\end{aligned}$
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