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  • Which among the following statements is incorrect with respect to Castner- Kellner cell.   Option: 1 <p style="list-style-type:decim

Which among the following statements is incorrect with respect to Castner- Kellner cell. 

 

Option: 1

Brine solution flows in the opposite direction of mercury


Option: 2

Sodium amalgam reacts with water to give NaOH


Option: 3

Mercury is re-circulated to the cell


Option: 4

\mathrm{H}_2 and \mathrm{Cl}_2 were the by-products


Answers (1)

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In Castner-Kellner cell, mercury is used as cathode and it flows along the bottom of the cell. The brine solution flows in the same direction as that of mercury and on reaction with mercury, it forms mercury amalgam. 

Mercury amalgam on reacting with water gives \mathrm{NaOH}, \mathrm{Hg} and \mathrm{H}_2 .

2 \mathrm{NaHg}+2 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{NaOH}+2 \mathrm{Hg}+\mathrm{H}_2

\mathrm{Hg} is re-circulated to the cell for cyclic process. \mathrm{Cl}_2 gas is liberated from the anode. Hence, \mathrm{H}_2 and \mathrm{Cl}_2 were the useful by-products of the reaction.

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