Chemistry
Substance used as an anti freeze in radiators of automobiles is :

Methyl alcohol and H2O
Ethyl alcohol and H2O
Ethyl alcohol
Methyl alcohol

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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 miscible with each other
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

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