Chemistry
Poison used for killing rats is

Magnesium phosphide (Mg3P2)
Calcium phosphide (Ca3P2)
Zinc phosphide (Zn3P2)
Magnesium nitride (Mg3N2)

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Chemistry
Sullage water is –

Waste water released from toilets
Waste water released from hospitals
Waste water released from kitchen
Waste water released from factories

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