Assertion (A): Mass remains constant in a closed system.
Reason (R): Matter cannot be created or destroyed.

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A Both A and R are true and R is the correct explanation of A
B Both A and R are true, but R is not the correct explanation of A
C A is true but R is false
D Both A & R are false

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Answer: A. Both A and R are true and R is the correct explanation of A

In a closed system nothing enters or leaves. By the law of conservation of mass, matter cannot be created or destroyed, so the total mass stays the same even if changes happen inside. R explains A.

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Assertion (A): Mass remains constant in a closed system. Reason (R): Matter cannot be created or destroyed.

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Assertion (A): Mass remains constant in a closed system.
Reason (R): Matter cannot be created or destroyed.