Chemistry
The Latin word formica means ant. The name formic acid is derived from this Latin word because

this acid, in ancient times, was used to eliminate ant-hills
this corrosive acid is secreted by ants to drive away their enemies
ants are attracted by the odour of this acid
this acid was first obtained by the distillation of ants

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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 are miscible with each other
Water and petrol react chemically

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