Chemistry
The Bhopal gas tragedy was caused by the gas

Methyl chloride
Methyl Iso Cyanate
Methyl Cyanide
Methyl Iso Cyanide

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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
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

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