Chemistry
Wax used for making candle is chemically a mixture of

Aliphatic and aromatic hydrocarbons
Aromatic hydrocarbons
Cyclic hydrocarbons
Aliphatic hydrocarbons

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

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
The oxygen content of water is isolated by petrol and thus it helps in burning
Petrol is too inflammable to be extinguished by water

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