Chemical Process
White phosphorous is stored under water, because

Its kindling temperature in dry air is very low
It is unstable
It does not react with water
It is poisonous

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Chemical Process
Presence of carbonaceous matter in the sewage

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

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