select the order of evaporation for water, alcohol, petrol, and kerosene oil.

water > alcohol > kerosene oil > petrol

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alcohol > petrol > water > kerosene oil

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petrol > alcohol > water > kerosene oil

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petrol > alcohol > kerosene oil > water

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Solution

The correct option is B alcohol > petrol > water > kerosene oil
A substance that has a lower boiling point will evaporate first. Boiling points of given species are:-
1) Boiling point of water = $100^{o} C$
2) Boiling point of alcohol = $79^{o} C$ (here ethanol is considered as alcohol)
3) Boiling point of petrol = $95^{o} C$
4) boiling point of kerosene = $150^{O} C - 300^{o} C$
Hence, the correct answer is $B$ .

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Separation of kerosene oil and water is done by ___.

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