Select from the following a decomposition reaction in which the source of energy for decomposition is light:
- 2FeSO4 → Fe2O3 + SO2 + SO3
- 2H2O → 2H2 + O2
- 2AgBr → 2Ag + Br2
- CaCO3 → CaO + CO2
The Correct Option is C
Solution and Explanation
Photolysis refers to a decomposition reaction driven by light energy. Silver bromide (\( \text{AgBr} \)) decomposes under light to form silver (\( \text{Ag} \)) and bromine (\( \text{Br}_2 \)):
\[2\text{AgBr} \rightarrow 2\text{Ag} + \text{Br}_2\]
This reaction is extensively used in photographic films, where light exposure causes the breakdown of silver halides.
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