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The reaction 2H₂O → 2H₂ + O₂ in sunlight is an example of a:
A{'text': 'Photochemical reaction'}
B{'text': 'Combination reaction'}
C{'text': 'Combustion reaction'}
D{'text': 'Neutralisation reaction'}
Answer & Solution
Correct answer: A. {'text': 'Photochemical reaction'}
1. Some reactions need light energy (photons) to proceed.
2. Such reactions are called **photochemical reactions**.
3. Photosynthesis is a familiar biological photochemical reaction.
4. Combination would join species rather than split water; combustion needs oxygen as a reactant.
_Source: Selina Concise ICSE Class 8 Chemistry Ch 6 "Chemical Reactions", Factors affecting reaction rates_
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