Question

Which of these reactions is a combustion reaction? 1. burning wood 2.decomposition of water 3. production of food by plants with the help of the Sun's energy 4.rotting of fruits and vegetables

Answer 1

Burning wood because you need oxygen to set a fire

Answer 2

Answer: The correct answer is Option 1.

Step-by-step explanation:

Combustion reaction is defined as the reaction in which a hydrocarbon reacts with oxygen molecule to produce carbon dioxide and water molecule as a product.

`\text{hydrocarbon}+O_2\rightarrow CO_2+H_2O`

Decomposition reaction is defined as the reaction in which a large substance breaks down into two or more smaller substances.

`AB\rightarrow A+B`

Oxidation reaction is defined as the reaction in which a substance gets oxidized by gaining oxygen or when they react with oxygen atoms.

From the given options:

Wood is totally composed of hydrocarbon and its burning requires oxygen molecule. So, burning of wood is considered as combustion reaction.

Hence, the correct answer is Option 1.