Chemistry
Which method will be employed to test the hardness of water?

None of these
Distillation
Formation of lather with soap
Boiling

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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 react chemically
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

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