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Question : 70 of 150
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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) + (g)
- Silver bromide also behaves in the same way.
- 2AgBr(s) Sunlight --> 2Ag(s) + (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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