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. T

Question

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 )

TestHub · Accepted Answer

One equivalent of substance deposited for $96500 C$ (one Faraday).

$i \times t$ Columbus of charge can be utilised to get $w g$ of substance.

Millimoles of $Ni$ coated

$= \frac{(2 x) 100}{96500 \times 2}$

$= \frac{10 x}{965}$

Mass of $Ni = (\frac{x}{965}) 600$

$= \frac{600 x}{965} mg$

Volume $= \frac{60 x}{965} \times 10^{- 3} {cm}^{3}$

$= 100 \times 10^{- 4}$

$\Rightarrow x = 0.1608 \times 10^{3}$

$\approx 161$

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