Question

Hich of these reactions is a combustion reaction?

burning wood
decomposition of water
production of food by plants with the help of the Sun's energy
rotting of fruits and vegetables
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Answer 1

for combustion reaction we need oxygen and the results most of the time produce heat which mean first one is correct.

Answer 2

Answer : The correct option is, burning wood.

Explanation :

Combustion reaction : It is a type of chemical reaction in which a hydrocarbon molecule react with oxygen to give or produce carbon dioxide and water as a product.

Decomposition reaction : It is a type of chemical reaction in which the larger molecule decomposes into two or more smaller molecules.

Oxidation reaction : It is a type of chemical reaction in which the substance oxidizes by gain of oxygen or react with oxygen.

From this we conclude that, the burning of wood is an example of combustion reaction because wood is a type of hydrocarbon that react or burn with oxygen to give carbon dioxide and water as a product.

Hence, the correct option is, burning wood.