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

Water and petrol react chemically
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
The flame is too hot for water to cool it down

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Chemistry
Which of the process is known as nitrification?

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

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