Q.

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)2for ‘x’ seconds to coat the desired layer. The value of x is ________. (Nearest integer) (ρNi(density of Nickel) is 10 g mL1, Molar mass of Nickel is 60 g mL1,F=96500Cmol1)

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answer is 161.

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Detailed Solution

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V=100×0.00110=0.01cm3  weight of Ni=d×V  =10×0.01  =0.1gm m=zit  0.1=E96500it  0.1=602×96500×2×t t=160.8161

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