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a
Down's cell
b
Castner cell
c
Solvay process
d
Castner Kellner cell
answer is D.
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Detailed Solution
NaOH is prepared byi) Castner - Kellner cell processii) Nelson - cell (or) Diaphram process→ Down's cell, castner cell Process are the electrolysis process used for the extraction of "Na" metal→ Solvay process is used for the manufacture of Na2CO3