Q. The atomic weight of silver and copper are 108 and 64. A silver voltmeter and a copper voltmeter are connected in series and when current is passed $10.8\ gm$ of silver is deposited. The mass of copper deposited will be
A) $6.4\ gm$
B) $12.8\ gm$
C) $3.2\ gm$
D) $10.8\ gm$
Explanation
(d) Equivalent weight of copper $= \frac{64}{2} = 32$
$\frac{Equivalent\ weight\ of\ Cu}{Equivalent\ weight\ of\ Ag} = \frac{Weight\ of\ Cu\ deposited}{Weight\ of\ Ag\ deposited}$
Weight of copper deposited $= \frac{10.8 \times 32}{108} = 3.2gm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.