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Science class 9 important questions are very helpful to score high marks in board exams. The students should read these basic concepts to gain perfection which will help him to get more marks in cbse examination. Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always 1. Class 9 important questions for science atoms and molecules. Molecules are formed by the combination of two or more atoms.
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