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In Castner-Kellner cell for production of sodium hydroxide:

1. Brine is electrolyzed with Pt electrodes
2. Brine is electrolyzed using graphite electrodes
3. Molten sodium chloride is electrolyzed
4. Sodium amalgam is formed at mercury cathode

Correct answer: Sodium amalgam is formed at mercury cathode

Solution

In the Castner-Kellner cell, brine is electrolyzed, and sodium amalgam is formed at the mercury cathode, which reacts with water to produce sodium hydroxide.

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