Chemistry
Bhopal gas tragedy is associated with leakage of

Sulphur dioxide
Methyl isocyanate
Nitrogen dioxide
Carbon dioxide

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

Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
The flame is too hot for water to cool it down
Water and petrol are miscible with each other
Water and petrol react chemically

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