Chemical Process
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

Consumes less power per ton of Cl₂ produced
Has larger production capacity per unit cell
Produces high purity (70%) caustic soda directly
All of these

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Chemical Process
Use of hydrated lime in water treatment

All of these
Before filtration, reduces the bacterial load on filters
Is to adjust the pH value
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂

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