Choose the incorrect statement related to Castner- Kellner cell.

Sodium amalgum react with water to give NaOH

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Mercury is re-circulated to the cell

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H_{2}

and

C l_{2}

were the by-products

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Brine solution flow in opposite direction of mercury

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Solution

The correct option is D Brine solution flow in opposite direction of mercury
In Castner-Kellner cell, mercury is used as cathode and it flow along the bottom of the cell. The brine solution flow in same direction of mercury and they react with mercury to form mercury amalgam.
Mercury amalgam on reacting with water gives NaOH, Hg and $H_{2}$ .
$2 N a H g + 2 H_{2} O \to 2 N a O H + 2 H g + H_{2}$
Hg is re-circulated to the cell for cyclic process. $C l_{2}$ gas is liberated from the anode. Hence, $H_{2}$ and $C l_{2}$ were the usefull by-products of the reaction.
Hence, the wrong statement is (d).

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