Chemical reactions that take place by the action of light energy are called _______.

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Solution

Photochemical Reactions:
Some chemical reactions take place by the action of light energy.
Such reactions are called photochemical reactions.
Example of photochemical reaction is:
$\underset{Silver chloride}{2 AgCl (s)} \overset{l i g h t}{\to} 2 A g (s) + C l_{2} (g)$
Therefore, chemical reactions that take place by the action of light energy are called photochemical reactions.

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