Q. The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltmeters are connected in series and electric current is passed through for sometime, $1.6\ g$ of copper is deposited. Then, the mass of silver deposited will be
A) $3.5\ g$
B) $2.8\ g$
C) $5.4\ g$
D) None of these
Explanation
(c) From Faraday’s law, $m/E =$ constant
where$\ m =$ mass of substance deposited,$\ E =$ chemical equivalent
$\therefore\frac{m_{2}}{m_{1}} = \frac{E_{2}}{E_{1}} \Rightarrow m_{2} = \frac{108}{32} \times 1.6 = 5.4g$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.