Q.

Which of the following reactions occurs in the presence of the sun?


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a

Exothermic reaction

b

Endothermic reaction

c

Photochemical reaction

d

Addition reaction 

answer is C.

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Detailed Solution

The reaction that occurs in the presence of the sun is called a photochemical reaction.    A photochemical reaction is a type of redox reaction (oxidation and reduction reactions)where ions reduce and oxidise in the presence of the sun. The chemical reaction is initiated by the absorption of energy in the form of light from the sun.The consequence of molecules absorbing light is the creation of excited states whose chemical and physical properties differ greatly from the original molecules.For example, photosynthesis is an example of a photochemical reaction where plants prepare glucose and liberate oxygen using carbon dioxide and water from the atmosphere in the presence of sunlight.
 
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