A metal surface of 100 cm 2 area has to be coated with nickel layer of thickness 0 . 001 mm . A current of 2 A was passed through a solution of Ni NO 3 2 for ‘ x ’ seconds to coat the desired layer. The value of x is _________. (Nearest integer) ( ρNi (density of Nickel) is 10 g mL – 1 , Molar mass of Nickel is 60 g mol - 1 F = 96500 Cmol - 1 )

Step-by-step solution

One equivalent of substance deposited for 96500 C (one Faraday). i × t Columbus of charge can be utilised to get w   g of substance. Millimoles of Ni coated = ( 2 x ) 100 96500 × 2 = 10 x 965 Mass of Ni = x 965 600 = 600 x 965 mg Volume = 60 x 965 × 10 - 3   cm 3 = 100 × 10 - 4 ⇒ x = 0 . 1608 × 10 3 ≈ 161