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BITSAT 2013
Exam
BITSAT
Year
2013
Subject
Chemistry
Chapter
Electrochemistry

BITSAT 2013 · Chemistry · Electrochemistry

The electrolytic cells, one containing acidified ferrous chloride...

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

Options

  1. A3: 1
  2. B2: 1
  3. C1: 1
  4. D3: 2

Correct answer

D. 3: 2

Step-by-step solution

At cathodes: Fe++2\mathrme−⟶Fe;\mathrm{Fe}^{+}+2 \mathrme^{-} \longrightarrow \mathrm{Fe} ; Fe3++3\mathrme−⟶Fe(EFe)1= At. wt. 2;(EFe)2= At. wt. 3\begin{array}{l}\mathrm{Fe}^{3+}+3 \mathrme^{-} \longrightarrow \mathrm{Fe}\\ \left(\mathrm{E}_{\mathrm{Fe}}\right)_{1}=\frac{\text{ At. wt. }}{2};\left(\mathrm{E}_{\mathrm{Fe}}\right)_{2}=\frac{\text{ At. wt. }}{3} \end{array}Hence, $\frac{\left(\mathrm{E}_{\mathrm{Fe}}\right)_{1}}{\left(\mathrm{E}_{\mathrm{Fe}}\right)_{2}}=\frac{3}{2}
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