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Rajasthan Police Constable Model Paper 8
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© examsnet.com
Question : 70
Total: 150
White silver chloride turning grey in sunlight is an example of?
Combination Reaction
Displacement Reaction
Decomposition Reaction
Oxidation Reaction
Validate
Solution:
White silver chloride turning grey in sunlight is an example of Decomposition Reaction.
White silver chloride turns grey in sunlight.
This is due to the decomposition of silver chloride into silver and chlorine by light.
2AgCl(s) (in presence of Sunlight) --> 2Ag(s) +
C
l
2
(g)
Silver bromide also behaves in the same way.
2AgBr(s) Sunlight --> 2Ag(s) +
B
r
2
(g)
The above reactions are used in black and white photography.
The decomposition reactions require energy either in the form of heat, light or electricity for breaking down the reactants.
Reactions in which energy is absorbed are known as endothermic reactions.
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