what is order of a photochemical reaction?Explain in detail.

Generally , Photochemical reactions are of Zero order because the rate of reaction does not depend upon the concentration of any of the reactant but it depends upon the  quanta of light absorbed. The rate of reaction depends upon the amount of light present which helps photosensitizers to carry out the reaction.

for eg :

6CO2 (g) + 6H2O (g) chlorophylllight C6H12O6 + 6O2

In photosynthesis the rate of reaction depends upon the light and chlorophyll(Photosensitizer).

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