Assertion :In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. Reason: According to the law of conservation of mass, matter can neither be created nor be destroyed.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

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Assertion and reason both are correct statements but reason is not correct explanation for assertion.

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Assertion is correct statement but reason is wrong statement.

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Assertion is wrong statement but reason is correct statement.

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Solution

The correct option is A Assertion and reason both are correct statements and reason is correct explanation for assertion.
According to the law of conservation of mass, matter can neither be created nor destroyed, so the total quantity of matter, i.e., the total mass, before and after a reaction, remains the same.

From this, it can be concluded that any new substance formed during a chemical change is due to the rearrangement of the atoms of the original substance. The number of atoms of each kind remains the same, before and after the chemical change.

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