Chemistry
Which one of the following is extensively used for sterilizing water ?

Bleaching powder
Soda powder
Borax powder
Alum

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

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