Which of the following is a decomposition reaction?

CH₄ + 2O₂ →CO₂ + 2H₂O

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2Pb(NO₃)₂ → 2PbO + 4NO₂+ O₂

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3Fe + 4H₂O → Fe₃O₄ + 4H₂

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2 KI +Cl₂ → 2KCl +I₂

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Solution

The correct option is B
2Pb(NO₃)₂ → 2PbO + 4NO₂+ O₂

A chemical reaction in which a single compound splits into two or more simple substances is called a decomposition reaction.

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

H_{2} S + C l_{2} \to 2 H C l + X

(N O_{3})_{2} \to 2 P b O + 4 N O_{2} + Y

2 K I + C l_{2} \to 2 K C l + I_{2}

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

2 K + C l_{2} \underset{}{\to} 2 KCl

K I + C l_{2} \to K C l + I_{2}

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