Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
In decomposition reaction, a single reactant breaks down into two or more simpler product, while in combination reaction two or more reactant combine to form a single product. Therefore decomposition and combination reaction are opposite.
Example of decomposition :
(i) 2FeSO4(s) --Heat→ Fe2O3(s) + SO2(g) + SO3(g)
Ferrous sulphate Ferric oxide
(ii) CaCO3(s) --Heat→ CaO(s) + Co2(g)
Lime stone Quick lime
Example of combination :
(i) CaO(s) + CO2(g) → CaCO3(s)
Quick lime Carbon dioxide Lime stone
(ii) Burning of coal →
C(s) + O2(g) → CO2(g)
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