Chemistry
Gas released during Bhopal tragedy was :

Ethyl isothiocyanate
Methyl isothiocyanate
Sodium isothiocyanate
Potassium isothiocyanate

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

Water and petrol react chemically
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

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