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AIIMS 2008
Exam
AIIMS
Year
2008
Subject
Chemistry
Chapter
Electrochemistry

AIIMS 2008 · Chemistry · Electrochemistry

The time period to coat a metal surface of (80 ~cm^ 2) with (5 ×...

The time period to coat a metal surface of (80 \mathrm{~cm}^2) with (5 ×\times10^{-3}  cm\mathrm{~cm}) thick layer of silver (density (1.05  g cm−3\mathrm{~g} \mathrm{~cm}^{-3}) ) with the passage of (3  A\mathrm{~A}) current through a silver nitrate solution is

Options

  1. A(115 \mathrm{sec})
  2. B(125 \mathrm{sec})
  3. C(135 \mathrm{sec})
  4. D(145 \mathrm{sec}).

Correct answer

B. (125 \mathrm{sec})

Step-by-step solution

 Weight of Ag required =V×d=80×5×10−3×1.05=0.42∵W= Eit 96500∴0.42=108×3×t96500⇒t=125sec.\begin{aligned} & \text{ Weight of Ag required }=V \times d \\ & =80 \times 5 \times 10^{-3} \times 1.05=0.42 \\ & \because \quad W=\frac{\text{ Eit }}{96500} \\ & \therefore \quad 0.42=\frac{108 \times 3 \times t}{96500} \Rightarrow t=125 \mathrm{sec} .\end{aligned}
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