A) Cyanide process
B) Castner process
C) Down's process
D) Both (a) and (c)
Correct Answer: B
Solution :
Electrolysis of fused \[NaOH\] is carried out at \[330{}^\circ C\] using iron as cathode and nickel as anode in Castner's process as follows: \[2NaOH2N{{a}^{+}}+2O{{H}^{-}}\] At cathode: \[2N{{a}^{+}}+2{{e}^{-}}\to 2Na\] At anode: \[4O{{H}^{-}}\to 2{{H}_{2}}O+{{O}_{2}}+4{{e}^{-}}\] Hence, the correct option is (b).
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