Conservation Of Mass in Class 9 Science : Practice MCQ Questions & Answers with Explanations

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1.

What does the law of conservation of mass state?

A

Mass is gained during a chemical reaction

B

Mass remains constant during a chemical reaction

C

Mass can be created in a chemical reaction

D

Mass is lost during a chemical reaction

View Answer

Correct Answer: B — Mass remains constant during a chemical reaction

Explanation:

Mass is neither created nor destroyed during a chemical reaction.