Which of the following is a decomposition reaction ?

N a O H + H C l \to N a C l + H_{2} O

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N H_{4} C N O \to H_{2} N C O N H_{2}

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2 K C l O_{3} \to 2 K C l + 3 O_{2}

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H_{2} + I_{2} \to 2 H I

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Solution

The correct option is B $2 K C l O_{3} \to 2 K C l + 3 O_{2}$
Decomposition reaction - separation of a substance into two or more substances that may differ from each other and from the original substance.
2KClO $_{3}$ $\to$ 2KCl + 3O $_{2}$

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2 K C l O_{3} \to 2 K C l + 3 O_{2}

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