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Q.

The following are the statements regarding NaOH
i) It is prepared by Castner-Kelner process
ii) The cathode in the outer compartments in mercury cathode method is Hg

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a

both are correct

b

only (i) is correct

c

both are wrong

d

only (ii) is correct

answer is A.

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Detailed Solution

detailed_solution_thumbnail

NaOH is prepared by
1) castner-Keler process
2) Nelson cell process

Question Image

It has 3-compartment
Two outer compartment
One middle compartment

Reaction in outer compartments	Reactions in middle compartment
Electrolysis: 2NaCl_(aq) → 2 Na⁺ + 2Cl^–	Electrolysis : 2 H₂O→2H⁺+2OH^–
At Anode(graphite): 2Cl ^–→Cl_2(g)+2e ^–	At Anode(Hg) : 2 Na-Hg → 2Na⁺ +2 Hg + 2 e ^–
At Cathode (Mercury): Na(g) + Hg → Na-Hg	At Cathode (Fe) : 2H⁺ + 2e ^– → H₂

In outer compartments; Hg-Acts as cathode graphite is acting as anode
In middle compartment;Hg acts as anode and Fe - acts as cathode

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