Q23 / 125 · BITSAT 2009 · Chemistry

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are Figure

  • A
    (a)
  • Correct answer
    B
    (b)
  • C
    (c)
  • D
    (d)

Solution

In electrolytic purification cathode is of pure metal and anode is of impure metal. At anode: $\mathrm{M} \rightarrow \mathrm{M}^{\mathrm{n}+}+\mathrm{n} \overline{\mathrm{e}}$ At cathode: $\mathrm{M}^{\mathrm{n}+}+\mathrm{n} \overline{\mathrm{e}} \rightarrow \mathrm{M}$. The pure metal is thus deposited at cathode.

Hence, the correct answer is option: 'B'.

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