Chemical Process
Celluloid is chemically

Regenerated cellulose
Cellulose nitrate
Cellulose acetate butyrate
Cellulose acetate

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Chemical Process
Use of hydrated lime in water treatment

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

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