Chemistry
Domestic cooking gas consists mostly of

Liquified butane and isobutane
Methane and ethane
Hydrogen and acetylene
Ethylene and carbon monoxide

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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 react chemically
Water and petrol are miscible with each other

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