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chemistry

Which of the following is a combustion reaction?

A

Boiling of water

B

Melting of wax

C

Burning of petrol

D

None of these

Answer

Combustion reactions always involve molecular oxygen . Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat). For example: When wood burns, it must do so in the presence of and a lot of heat is produced.

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