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

Both b and c

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H_{2} + O \to {2H}_{2} O

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

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4H + O_{2} \to {2H}_{2} O

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Solution

The correct option is A Both b and c
According to law of conservation of mass, in all chemical changes the total mass of the system remains constant but in b and c mass of reactants is not equal to mass of products.

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A balanced chemical equation obeys the law of conservation of mass.

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