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Silver bromide turning from yellow to grey on exposure to light is an example of which kind of decomposition reaction?
AThermal decomposition
BPrecipitation reaction
CElectrolytic decomposition
DPhoto decomposition
Answer & Solution
Correct answer: D. Photo decomposition
1. The change is caused by light falling on silver bromide.
2. Decomposition brought about by light is photo decomposition (photolysis).
3. Thermal decomposition needs heat and electrolytic needs electric current, so neither applies here.
4. Therefore this is a photo decomposition reaction.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Photo Decomposition Reactions", p.147_
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