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  4. 3 Faradays of 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

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Q. $3$ Faradays of 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

NTA AbhyasNTA Abhyas 2022

Solution:

$F e^{2 +}+2e^{-} \rightarrow Fe$
$ \, \text{E}_{F e}=\frac{56}{2}=28$
$\text{w}_{F e}=E_{F e}\times \, $ number of Faraday
$=28\times 3=84 \, g$