In photosynthesis in plants, H2O and CO2 react in presence of light and chlorophyll to give carbohydrate and oxygen. When the carbohydrate is burnt in air, the gases produced are:
A
CO2+H2
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B
CO2+CO
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C
CO2+H2O
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D
CO2+O2
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Solution
The correct option is CCO2+H2O The carbohydrate is glucose. The combustion of glucose is as follows:
C6H12O6+6O2→6H2O+6CO2+heat
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.