Which one of the following reactions occur at the anode in tie Castner process of extracting sodium metal?

Options

A. `H_(2) rarr 2H^(+) + 2e^(-)`
B. `2Cl^(-) rarr Cl_(2) +2e^(-)`
C. `4OH^(-) rarr 2H_(2)O +O_(2) +4e^(-)`
D. `Na^(+) + e^(-) rarr Na`

Answer

(c )

Explanation

In Castner's process of extraction of sodium, the oxidation reaction occuring at anode is
`4OH^(-) rarr 2H_(2)O + O_(2) + 4 e^(-)`