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Q.

Sodium cannot be extracted by electrolysis of aqueous solutions due to

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a

Sodium has high vapour pressure

b

Preferential discharge theory

c

Sodium is less reactive

d

Sodium liberated reacts with H2O and forms NaOH and H2

answer is D.

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Detailed Solution

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When aqueous NaCl solution is electrolysed, Cl2​ is formed at the anode and Na at the cathode. But Na is very reactive with H2​O forming NaOH and H2​. Thus, Na cannot be prepared by electrolysis of aq. NaCl.
NaCl(aq) ⇌ Na++Cl−
At anode: 2Cl−→Cl2​+2e−
At cathode: 2Na++2e−→2Na

2Na+2H2​O→2NaOH+H2​

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