Question

NaOH is prepared by the method.

• A. Down’s cell
• B. Castner cell
• C. Solvay process
• D. Castner Kellner cell

Answer 1

Answer: (D)

Castner Kellner cell

Answer 2

The cell involves the following reaction,

$NaCl$ ⇌$Na^{+} + Cl^{-}$

At anode : $2Cl^{-} \rightarrow 2Cl + 2e \rightarrow Cl_{2}$

At cathode : $Na^{+} + e \rightarrow Na$

$Na + Hg \rightarrow$amalgam

At anode : $Na -$amalgam$\rightarrow Na^{+} + Hg + e$

At cathode : $2H_{2}O + 2e \rightarrow H_{2} \uparrow + 2OH^{-}$