1. Tardigrade
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  3. Chemistry
  4. The electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride are connected in series. The ratio of iron deposited at cathodes in the two cells when electricity is passed through the cells will be

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Q. The electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride are connected in series. The ratio of iron deposited at cathodes in the two cells when electricity is passed through the cells will be

BITSATBITSAT 2013

Solution:

In $FeCl _{2}, Fe ^{+2}$ is present
& in $FeCl _{3}, Fe ^{+3}$ is present
At cathode: $- Fe ^{+2}+2 e ^{-} \rightarrow Fe$ ...(i)
$Fe ^{+3}+3 e ^{-} \rightarrow Fe$ ... (ii)
Equivalent weight of $F$ e in
(i) $=\frac{\text { Atomic weight }}{ n }=\frac{\text { Atomic weight }}{2}$
Equivalent weight of $Fe$ in
(ii) $=\frac{\text { Atomic weight }}{3}$
$\therefore $ Ratio of iron deposited at cathodes
$=\frac{ A / 2}{ A / 3}=3: 2$