Chemistry
Which one of the following is not a ‘green house gas’ ?

Carbon dioxide
Nitrogen
Methane
Chlorofluorocarbons

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Chemistry
Why is water not suitable for putting out a petrol fire ?

The oxygen content of water is isolated by petrol and thus it helps in burning
Water, being heavy, slips below petrol which thus remains in contact with air and burns
Petrol is too inflammable to be extinguished by water
The heat required for combustion of petrol is very low

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