Discussion
Match each cell type with its distinguishing feature.
List I
A. Mercury cell
B. Diaphragm cell
C. Membrane cell
D. Solvay process
List II
1. an ion selective membrane passing only sodium ions
2. a flowing mercury cathode forming an amalgam
3. no electrolysis at all, using ammonia and limestone
4. an asbestos or polymer separator with liquid flow through it
Answer: D
The three cells differ in how they keep the chlorine and the caustic apart, and each gives a different product purity and energy consumption. The Solvay process is included because it makes soda ash by an entirely different route.
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