JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
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 \(Ni \left( NO _3\right)_2\) for ' \(x\) ' seconds to coat the desired layer. The value of \(x\) is \(.........\). (Nearest integer) ( \(\rho_{ Ni }\) (density of Nickel) is \(10 \,gmL ^{-1}\), Molar mass of Nickel is \(60\,gmol ^{-1} F =96500\,C\,mol ^{-1}\) )
- A \(160\)
- B \(162\)
- C \(161\)
- D \(163\)
Answer & Solution
Correct Answer
(C) \(161\)
Step-by-step Solution
Detailed explanation
\(W = z \times i \times t\) Density \(\times\) volume \(=\frac{E \times i \times t}{96500}\) \(10 \times 100 \times 0.0001=\frac{\left(\frac{\text { atomic wt. }}{\text { v.f }}\right) \times 2 \times x}{96500}(\text { v.f }=2)\) \(\therefore x=161\,sec \text {. }\)
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