When light is absorbed a photochemical change may take place. When molecules are excited by a striking quantum (unit) of light :

then they may react in any number

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none of them react

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all of them react

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then certain proportion of them react

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Solution

The correct option is D then certain proportion of them react
When light is absorbed,a photochemical change may take place.When molecules are excited by a striking quantum(unit) of light,then certain proportion of them react

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When light is absorbed a photochemical change may take place. When molecules are excited by a striking quantum (unit) of light :

The correct option is D then certain proportion of them reactWhen light is absorbed,a photochemical change may take place.When molecules are excited by a striking quantum(unit) of light,then certain proportion of them react

The correct option is D then certain proportion of them react
When light is absorbed,a photochemical change may take place.When molecules are excited by a striking quantum(unit) of light,then certain proportion of them react