Down's method is used for the extraction of :

A l

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N a

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M g

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C u

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Solution

The correct option is B $N a$
Sodium $(N a)$ metal is extracted by "Down's Method". Down's method is based on the electrolysis of fused $N a C l$ .
Cathode: $2 N a^{+} + 2 e^{-} \to 2 N a$ (Reduction)

Anode: $2 C l^{-} \to C l_{2} + 2 e^{-}$ (Oxidation)

Overall reaction: $2 N a^{+} + 2 C l^{-} \to 2 N a + C l_{2}$
Option B is correct.

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Down's method is used for the extraction of :

The correct option is B NaSodium (Na) metal is extracted by "Down's Method". Down's method is based on the electrolysis of fused NaCl.Cathode: 2Na++2e−→2Na (Reduction)Anode: 2Cl−→Cl2+2e− (Oxidation)Overall reaction: 2Na++2Cl−→2Na+Cl2Option B is correct.