Q. 3 F electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. Wt. = 56) deposited at the cathode (in g) is
A) 65
B) 84
C) 112
D) 168
Explanation
(b)
${Fe}^{2 +} + 2e^{-} \rightarrow Fe$
$\ E_{Fe} = \frac{56}{2} = 28$
$w_{Fe} = E_{Fe} \times \$number of faraday
$= 28 \times 3 = 84\ g$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.