Which of the following is (are) not an example of a decomposition reaction?

C a O + C O_{2} \to C a C O_{3}

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C a C O_{3} \to C a O + C O_{2}

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C u + 2 A g^{+} \to C u^{2 +} + 2 A g

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C u S O_{4} + H_{2} S \to C u S + H_{2} S O_{4}

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Solution

The correct options are
A $C a O + C O_{2} \to C a C O_{3}$
C $C u + 2 A g^{+} \to C u^{2 +} + 2 A g$
D $C u S O_{4} + H_{2} S \to C u S + H_{2} S O_{4}$
All options other than option B are combination reactions.
The reaction in option B is a decomposition reaction as calcium carbonate is breaking into two components.
The reaction in option C is redox reaction and the reaction in option D is displacement reaction.

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C a C O_{3} \to C a O + C O_{2} ↑

2 A g N O_{3} + C u \to C u {(N O_{3})}_{2} + 2 A g ↓

2 S O_{2} + O_{2} \to 2 S O_{3} ↑

N a C l + A g N O_{3} \to A g C l ↓ + N a N O_{3}

Conversion of $C a C O_{3}$ into $C a O$ as per the reaction, $C a C O_{3} \to C a O + C O_{2}$ is an example of:

Column A Types of chemical reaction	Column B Chemical equations
(a) Combination reaction	(i) $C a C O_{3} A \to C a O + C O_{2}$
(b) Decomposition reaction	(ii) $2 H_{2} O E l e c t r i c i t y - ----- \to 2 H_{2} + O_{2}$
(c) Displacement reaction	(iii) $C a O + C O_{2} \to C a C O_{3}$
(d) Analysis reaction	(iv) $F e (s) + C u S O_{4} (a q .) \to F e S O_{4} (a q) + C u (s)$

The equilibrium constant for the reaction,

CaCO₃(s) ⇌ CaO(s) + CO₂(g), is

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