Classify the following into chemical combination, decomposition, displacement and double displacement reaction.
a. $C a C O_{3} \to C a O + C O_{2} ↑$
b. $2 A g N O_{3} + C u \to C u {(N O_{3})}_{2} + 2 A g ↓$
c. $2 S O_{2} + O_{2} \to 2 S O_{3} ↑$
d. $N a C l + A g N O_{3} \to A g C l ↓ + N a N O_{3}$

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Solution

$a)$ It is a chemical decomposition reaction. Single reactant converts to many products.
$b)$ It is displacement reaction. $'Ag'$ is displaced by $'Cu'.$
$c)$ It is example of chemical combination. Two reactants combine to form single product.
$d)$ It is double decomposition reaction. $'Na'$ in $NaCl$ is replaced by $'Ag'$ and $'Ag'$ in ${AgNO}_{3}$ is replaced by $'Na' .$

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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} ↑

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS]

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) $F e (s) + C u S O_{4} (a q .) \to F e S O_{4} (a q) + C u (s)$

NaCl + AgNO₃ → AgCl + NaNO₃ is an example of:

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