Question

Select from the following a decomposition reaction in which the source of energy for decomposition is light:

• A. 2FeSO₄ → Fe₂O₃ + SO₂ + SO₃
• B. 2H₂O → 2H₂ + O₂
• C. 2AgBr → 2Ag + Br₂
• D. CaCO₃ → CaO + CO₂

Answer 1

The Correct Option is C

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.