Chemistry
The greenhouse effect is caused by the higher level of which gas in the atmosphere ?

Carbon monoxide
Nitrous oxide
Carbon dioxide
Sulphur dioxide

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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
The heat required for combustion of petrol is very low
Petrol is too inflammable to be extinguished by water

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