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

Water and petrol react chemically
The flame is too hot for water to cool it down
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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Chemistry
Which of the process is known as nitrification?

Reaction of nitrogen dioxide with water to form nitric acid
Conversion of nitrite to nitric oxide
Reaction of Nitrogen Monoxide with oxygen to form nitric acid
Conversion of ammonia to nitrites

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

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
this acid, in ancient times, was used to eliminate ant-hills

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