Question

Three faradays electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in gm) is.

• A. 56
• B. 84
• C. 112
• D. 168

Answer 1

Answer: (B)

84

Answer 2

$Fe^{2 +} + 2e^{-} \rightarrow Fe;E_{Fe} = \frac{56}{2} = 28$

$W_{Fe} = E_{Fe}$ × Number of faraday $= 28 \times 3 = 84gm$.