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The cathode in middle compartment of Castner-Kellner process is

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Graphite

Mercury

Iron

Steel

answer is C.

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Detailed Solution

Correct Answer: Option (c)
The Castner-Kellner process is used for producing sodium hydroxide (NaOH) and chlorine (Cl₂) from brine.

The process uses three compartments: anode, middle compartment, and cathode.

The middle compartment contains iron cathode because:

Sodium ions (Na⁺) from brine are reduced at the cathode to form sodium metal.

Iron is chosen because it is stable in caustic (alkaline) conditions and does not react with sodium hydroxide.

Using graphite or mercury here would not be suitable for industrial-scale NaOH production.

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Tip to remember: Iron = Middle compartment = Sodium reduction

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