Question

A steady current of $1.5$A flows through a copper voltameter for $10$ min. If the electrochemical equivalent of copper is $30\times {10}^{-5}g{C}^{-1}$, the mass of copper deposited on the electrode will be

• A. $0.40g$
• B. $0.50g$
• C. $0.67g$
• D. $0.27g$

Answer 1

The correct option is D $0.27g$

Given : Electrochemical equivalent of copper, $E_{cu}=30\times {10}^{-5}$ $g{C}^{-1}$

Time for which the current flows, $t=10$ min $=10\times 60=600$ s

$\therefore$ Net charge flows, $q=I\times t=1.5\times 600=900$ $C$

Mass of copper deposited, $m=E_{cu}\times q=30\times {10}^{-5}\times 900=0.27g$