On commercial scale, sodium hydroxide is prepared by :

Options

A. Dow's process
B. Solvay process
C. Castner-Kellner cell
D. Hall-Heroult process

Answer

C

Explanation

(A) Used for extaraction of Mg from sea water.
(B)Used for the manufacture of `Na_2CO_3` using NaCl as raw material.
(C )Used for manufacture of NaOH by electrolysis of brine (concentrated NaCl solution).
(D)Used for the extraction of aluminium from bauxite.