Q20 / 200 · TS EAMCET 2002 · Chemistry

What is the reaction occurring at the anode in Down's process for the extraction of sodium?

  • A
    $4 \mathrm{OH}^{-} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2+4 e^{-}$
  • B
    $\mathrm{Na}^{+}+e^{-} \longrightarrow \mathrm{Na}$
  • Correct answer
    C
    $2 \mathrm{Cl}^{-} \longrightarrow \mathrm{Cl}_2+2 e^{-}$
  • D
    $\mathrm{NaOH} \longrightarrow \mathrm{Na}^{+}+\mathrm{OH}^{-}$

Solution

In Down's process, at anode, oxidation of $\mathrm{Cl}^{-}$into $\mathrm{Cl}_2$ gas takes place $$ 2 \mathrm{Cl}^{-} \longrightarrow \mathrm{Cl}_2+2 e^{-} $$

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

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