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The cathode in middle compartment of Castner-Kellner process is

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Iron

Mercury

Graphite

Steel

answer is C.

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Detailed Solution

The cathode in the middle compartment of the Castner-Kellner process (as shown in the diagram) is iron.

In the central compartment of the cell, an iron cathode is used.
This cathode is where sodium ions are discharged to form sodium amalgam, which later reacts to produce sodium hydroxide.
The side compartments use graphite anodes.

Final answer:
The cathode in the middle compartment of the Castner-Kellner process is iron.

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