Among the following, an atomic equation is

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${KClO}_{3} \to KCl + 3 O_{2}$

${KClO}_{3} \to KCl + 3 O$

$Mg + 2 HCl \to {MgCl}_{2} + H_{2}$

$4 HCl + O_{2} \to 2 H_{2} O + 2 {Cl}_{2}$

answer is C.

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Detailed Solution

In the atomic equation, at least an atom of element must be appeared either on reactant side or product side. In the given all reactions, for the decomposition of potassium chlorate reaction there is one oxygen (O) atom of element present the product side. Hence, it is an atomic equation.

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