The balancing of chemical equations is in accordance with (a) law of combining volumes (b) law of constant proportions (c) law of conservation of mass (d) both (b) and (c).
Answers
Answer:
According to the law, the mass of reactants = mass of products.
Explanation:
A balanced chemical equation is in accordance with The law of conservation of mass. The number of moles of atoms is equal and thus the above reaction is balanced . According to the law, the mass of reactants = mass of products.
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Answer:
B
Explanation:
- Option A is "Law of conservation of energy". The law of conservation of energy states that the energy can neither be created nor destroyed. Firstly, there is no job for energy in balancing chemical equations. In case of chemical reaction the energy released out by reactant, which is restored back after formation of product. Option A is the wrong answer.
- Option B is "Law of conservation of mass". The law of conservation of mass which states that the atoms are neither created nor destroyed. Applying the law of conservation of mass to a chemical, there is no atom destroyed from the reactant side nor created in the product, so the number of elements in the reactant is equal to the number of elements in the product. This is the theory behind balancing chemical equations. The law of conservation of mass attributes for balancing a chemical equation. Thus, option B is the correct answer.
- Option C is "Law of constant proportion". It states that a given compound always contains its component elements in fixed ratio and does not depend on its sources and method of preparation. Here the ratio means the amount of that particular element in grams per mole etc. This does not apply to balancing the chemical equation. Thus, option C is the wrong answer.
- Option D is "Law of multiple proportion". It states that if there are two elements from more than one compound between them, then the ratio of masses of the second element which combine with a fixed mass of the first element which combines with a fixed mass of the first element will always be a ratio of small whole numbers. Just from the statement we can figure out as in balancing we do not take ratio in first place. We compare the number of atoms of a particular element in reactant and in product. Make it equal if not equal. Thus, option D is the wrong answer. The correct answer is option “B” .