Chemistry
Bayer's reagent is

Alkaline potassium permanganate
Bromine water
Acidified potassium permanganate
Hydrogen peroxide

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

Water and petrol are miscible with each other
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
The flame is too hot for water to cool it down
Water and petrol react chemically

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