The incorrect statement about the Castner-Kel | vedclass

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Question

(C) In the Castner-Kellner cell process, electrolysis of brine ($NaCl$ solution) is performed. In this process, a mercury cathode and a carbon or grap

Vedclass · Accepted Answer

Mercury acts as anode and carbon rod acts as cathode

Vedclass · Answer

(C) In the Castner-Kellner cell process, electrolysis of brine ($NaCl$ solution) is performed. In this process, a mercury cathode and a carbon or graphite anode are used. At the anode, $Cl^-$ ions are oxidized to produce $Cl_2$ gas: $2Cl^- \rightarrow Cl_2 + 2e^-$. At the cathode, $Na^+$ ions are reduced and dissolve in mercury to form sodium amalgam $(Na-Hg)$: $Na^+ + e^- + Hg \rightarrow Na-Hg$. Therefore, the statement that mercury acts as the anode and carbon as the cathode is incorrect; it is the reverse. Thus, the correct option is $C$.

The incorrect statement about the Castner-Kellner cell process is

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