Chemistry
A solution is

A mixture of two liquids
A homogeneous mixture of two or more substances
A solid dissolved in a liquid
A solid dissolved i water

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

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

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