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The reaction 2HgO → 2Hg + O₂ is an example of a:
A{'text': 'Combination reaction'}
B{'text': 'Displacement reaction'}
C{'text': 'Neutralisation reaction'}
D{'text': 'Decomposition reaction'}
Answer & Solution
Correct answer: D. {'text': 'Decomposition reaction'}
1. A single compound (mercuric oxide) breaks down into two simpler substances (mercury and oxygen).
2. The general form is AB → A + B, which defines a **decomposition reaction**.
3. Heat is supplied to drive the breakdown.
4. Combination is the reverse process; displacement needs three species; neutralisation needs an acid and a base.
_Source: Selina Concise ICSE Class 8 Chemistry Ch 6 "Chemical Reactions", Types of chemical reactions_
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