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Question

Identify the type of chemical reaction wherein Silver chloride, originally white in colour, turns dark upon exposure to sunlight.


Correct Answer
A
Photolytic decomposition
Your Answer
B
Electrolytic decomposition
Your Answer
C
Thermal decomposition
Your Answer
D
Combination reaction

Solution

The correct option is A Photolytic decomposition
Decomposition reaction involves a reactant breaking down into one or more products by taking up energy in the form of heat (thermal decomposition), light (photolytic decomposition) or electricity (electrolytic decomposition).
Silver chloride in the presence of light energy from the sun, decomposes into silver and chlorine gas.
2AgCl (s)2Ag (s) + Cl(g)
Hence, it is a photolytic decomposition reaction.

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