Question

A layer of chromium metal $0.25mm$ thick is to be plated on an auto bumper with a total area of $0.32m^2$ from a solution containing $Cr{O}_4^{2-}$. What current flow is required for this electroplating if the bumper is to be plated in $60s$? The density of chromium metal is $7.20g/c{m}^3$.

• A. $4.9\times {10}^{3}A$
• B. $1.78\times {10}^{3}A$
• C. $10.69\times {10}^{4}A$
• D. $5.3\times {10}^{4}A$

Answer 1

Answer: (C)

Total volume of metal layer
$=0.25\times 0.32\times {10}^{-3}$
$\Rightarrow 0.08\times {10}^{-3}{m}^3$