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

${BaCl}_{2} + H_{2} {SO}_{4} \to {BaSO}_{4} + 2 HCl$

$CaO + {CO}_{2} \to {CaCO}_{3}$

${CaCO}_{3} \to CaO + {CO}_{2}$

$2 KI + {Cl}_{2} \to 2 KCl + I_{2}$

$2 H_{2} O \to 2 H_{2} + O_{2}$

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Solution

Each point: 1 Mark

Double displacement reaction

Combination reaction

Decomposition reaction

Displacement reaction

Decomposition reaction

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

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}

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

1.	Column-A Types of chemical reaction		Column-B Chemical equation
(A)	Combination reaction	(i)	$Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$
(B)	Oxidation & reduction reaction	(ii)	$2 H_{2} O E l e c t r i c i t y ⟶ 2 H_{2} + O_{2}$
(C)	Decomposition reaction	(iii)	$C a O + C O_{2} \to C a C O_{3}$
(D)	Displacement reaction	(iv)	$H_{2} + C l_{2} \to 2 H C l$
(E)	Double Displacement reaction	(v)	$B a C l_{2} + N a_{2} S O_{4} \to B a S O_{4} ↓ + N a C l$

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:

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