Which of the following represents an unbalanced chemical equation?

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$6 {CO}_{2} + 6 H_{2} O \to C_{6} H_{12} O_{6}$

${SiCl}_{4} + 4 H_{2} O \to H_{4} {SiO}_{4} + HCl$

$Na + 2 Cl \to NaCl$

$2 Al + 6 HCl \to 2 {AlCl}_{3} + 3 H_{2}$

answer is C.

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Detailed Solution

A chemical equation is said to be unbalanced, if the number of atoms on the reactant side and the number of atoms on the product side are different. This is happening in the equation $Na + 2 Cl \to NaCl$ , here number of chlorine atom are different on the reactant and product side.

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