Chemical Process
Bitterns is a/an

Unsaturated fat
None of these
By-product of chlor-alkali industry
Starting material for the production of iodine

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Chemical Process
Use of hydrated lime in water treatment

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

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Chemical Process
Presence of carbonaceous matter in the sewage

All of these
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification

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