Introduction
Photochemistry is the study of chemical effects produced by light radiations ranging from 2000 to 8000 Å wavelength.
Type of Chemical Reaction:
A chemical reaction is one in which, the identity of molecules is changed due to the breaking and formation of chemical bonds. There are two types of chemical reactions.
(i) Dark or Thermal reaction:
The reaction which is influenced by temperature, the concentration of reactants, catalyst etc. except light radiations are known as thermal reactions.
N2 + 3H2 ⇌ 2NH3
H2 + I2 ⇌ 2HI
(ii)Photochemical Reactions:
The reaction which is influenced by the action of light is known as photochemical reactions. Some examples are following,
2HBr ⟶ H2
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