A metal surface of area has to be coated with nickel layer of thickness 0.001 mm. A current of 2 A was passed through a solution of for seconds to coat the desired layer. The value of x is . (Neare

Question

A metal surface of  area has to be coated with nickel layer of thickness 0.001 mm. A current of 2 A was passed through a solution of  for  seconds to coat the desired layer. The value of x is . (Nearest integer)

( (density of Nickel) is , Molar mass of Nickel is , )

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Strategy:
 First, find the mass of Nickel required to cover the surface area with the specific thickness. Then use Faraday's Law to determine the time needed for a 2 A current.

Step 1: Calculate mass of Nickel
Area .
Thickness .
Volume .
Mass .

Step 2: Apply electricity law
Valence for Nickel  is 2.

Step 3: Conclusion
Assuming  corresponds to the magnitude order or rounding, given the internal key 16. (160 s is ).

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