The electrolyte used in castner's process of Na extraction is

Anhydrous Na₂CO₃

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aqueous NaOH

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NaCl + CaCl₂+ KF

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Fused anhydrous NaOH

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Solution

The correct option is D
Fused anhydrous NaOH

In castner's process, electrolysis of fused sodium hydroxide is carried out at 330 degree Celsius using iron as cathode and nickel as anode to obtain sodium metal.

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