Which of the following is an example of an unbalanced chemical equation?

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$NaCl + {AgNO}_{3} \to {NaNO}_{3} + AgCl$

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

$Fe + S \to {FeS}_{2}$

${CH}_{4} + 2 O_{2} \to {CO}_{2} + 2 H_{2} O$

answer is D.

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Detailed Solution

An unbalanced chemical equation is the one in which the number of atoms on the reactant side is not equal to the number of atoms on the product side. Out of the given option, it is only the $Fe + S \to {FeS}_{2}$ equation in which number of atoms are different on the reactant and product sides. So, it will be our answer.

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