Chemistry
Which one of the following is not a cause for present global warming and climate change ?

Carbondioxide emission
CFC emission
Deforstation
Methane emission

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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
Water and petrol react chemically
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

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