Which of the following is combustion reaction

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C+O2→CO2

CH4+O2→CO2+H2O

Mg+O2→MgO

All of these

answer is D.

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Detailed Solution

When all substances in a compound combine with oxygen and produces CO2 and H2O, it is commonly called burning. During combustion substance reacts with an oxidizing agent such as O2 and F2 . Not all combustion reaction releases CO2 and H2O e.g.Mg+O2→MgO+Heat.∴3.2gm will liberate =890×3.216=178kJ.

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