Chemistry
Muddy water is treated with alum in purification process, itis termed as :

Absorption
Emulsification
Adsorption
Coagulation

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Chemistry
Why is water not suitable for putting out a petrol fire ?

The oxygen content of water is isolated by petrol and thus it helps in burning
Petrol is too inflammable to be extinguished by water
The heat required for combustion of petrol is very low
Water, being heavy, slips below petrol which thus remains in contact with air and burns

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