Question

Silver is removed electrolytically from $200mL$ of a $0.1N$ solution of $AgN{O}_3$ by a current of $0.1A$. How long will it take to remove half of the silver from the solution ?

• A. $0.1s$
• B. $100s$
• C. $965s$
• D. $9650s$

Answer 1

Answer: (D)

$9650s$

Mmoles $AgN{O}_3=0.1\times 200=20$
$A{g}^{\oplus }+e^{-}\to Ag$
For $50\%$ electrolysis, 10 mF is required
$\Rightarrow 10mF=\frac{1t}{96500}\Rightarrow t=9650s$