Which of the following equations does not follow the law of conservation of mass?

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

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Fe + {ZnSO}_{4} \to {FeSO}_{4} + Zn

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H_{2} {CO}_{3} \to H_{2} O + {CO}_{2}

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2 HCl \to H_{2} + {Cl}_{2}

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Solution

The correct option is A $H_{2} + O_{2} \to H_{2} O$
The law of conservation of mass states that mass can neither be created nor be destroyed. In chemical reactions, the total mass of the reactant should be equal to the total mass of the product. This implies that the number of atoms of elements in the reactant should be equal to the number of atoms of those elements in the product.
Mass of reactant= mass of product .
Numbers of atoms of elements in reactant= numbers of atoms of elements in product.
Equations in options b, c and d have the above criteria fulfilled, whereas equation in option b does not.
Hence, a is the correct option.

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If H₂+ O₂= H₂O . So, while proving the law of conservation of mass Why we take O₂as 1/2 O₂?

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