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Combustion

In photosynth...

Question

In photosynthesis in plants, $H_{2} O$ and ${C O}_{2}$ react in presence of light and chlorophyll to give carbohydrate and oxygen. When the carbohydrate is burnt in air, the gases produced are:

A

{C O}_{2} + H_{2}

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B

{C O}_{2} + C O

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C

{C O}_{2} + H_{2} O

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D

{C O}_{2} + O_{2}

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Solution

The correct option is C ${C O}_{2} + H_{2} O$
The carbohydrate is glucose. The combustion of glucose is as follows:
$C_{6} H_{12} O_{6} + 6 O_{2} \to 6 H_{2} O + 6 C O_{2} + h e a t$
Combustion occurs when any organic material is reacted (burned) in the presence of oxygen to give off the products of carbon dioxide, water and energy. This is simply the process of metabolism.

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