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B
None of the above
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C
Mass of reactants and products
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D
Law of conservation of mass
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Solution
The correct option is D
Law of conservation of mass
Correct answer - (a): Law of conservation of mass
According to the Law of conservation of matter, atoms can neither be created nor be destroyed during a chemical reaction.
Therefore, a chemical equation needs to be balanced to make the number of atoms of elements present in the reactants equal to the number of atoms of the products.