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Question

The reactions favoured by light are called:
endothermic reactions
exothermic reactions
photochemical reactions
none of the above

A

photochemical reactions

B

endothermic reactions

C

none of the above

D

exothermic reactions

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Solution

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Photochemical reactions are the reaction that takes place in the presence of light.

For example, photosynthesis of plants. Photographic films which are coated with silver bromide (very small amount of silver iodide) undergo a chemical reaction when exposed to sunlight.

$C H_{4} (g) + C l_{2} (g) \to C H_{3} C l (g) + H c l (g)$

$6 C O_{2} (g) + 6 H_{2} O (l) \to C_{6} H_{12} O_{6} (a q) + 6 O_{2} (g)$

$2 A g B r (s) \to 2 A g (s) + B r_{2} (l)$

Thus option $C$ is correct.

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