Question

NaOH is obtained by electrolysis of
(a) Aq. solution of NaCl
(b) Aq. Na2CO3
(c) Aq. NaHCO3
(d) Molten NaCl

Answer 1

Answer:

A). Aq. solution of NaCl

Answer 2

Answer:

OPTION (a)  Aq. solution of $NaCl$

Explanation:

$NaOH$ is prepared by the electrolysis of aqueous $NaCl$ solution with graphite anode and iron cathode.

• The reaction at the anode (oxidation) will go as:

          $2Cl^{-} (aq.)$ → $Cl_{2} + 2e^{-}$

• The reaction at the cathode (reduction) will go as:

          $2H_{2} O (l) + 2e^{-}$ → $H_{2} (g) +2OH^{-} (aq.)$

• The net reaction will be:

          $2H_{2}O +2Cl^{-} (aq) + 2Na^{+} (aq)$ → $2Na(aq) +2OH^{-} (aq) +H_{2} +Cl_{2}$

Hence, $NaOH$ is obtained by electrolysis of an aqueous solution of $NaCl$.

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