Characteristics features of the photochemical reactions
(i) Each molecules which is participating in a photo process absorbs only one photon of radiant energy thereby increasing its energy level by hv or hc/λ
(ii) The Photochemical reactions do not take place in dark.
(iii) Each of the photochemical reaction requires a definite amount of energy which is characteristic of a particular wavelength of photon. For instance, reactions requiring more energy are carried out in presence of UV light (lower λ, more E/Photon). A reaction-taking place in UV light may not occur on exposure to yellow light (lower and lesser E/Photon)
(iv) The rate of the photochemical reactions depend upon intensity of radiation's absorbed.
(v) The values of ΔG for light initiated reactions may or may not be negative.
(vi) The temperature does not have any marked effect on the rate of light initiated reactions.
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