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State the Law of conservation of mass and the Law of constant proportion with examples. This mock test of Atoms & Molecules - Practice Test, Class 9 Science for Class 9 helps you for every Class 9 entrance exam. April 8, 2020 by physicscatalyst 4 Comments. Multiple Choice Questions (MCQ) for Atoms and Molecules - CBSE Class 9 Chemistry on Topperlearning. 9th CBSE Science Atoms and Molecule.. All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3:8. CBSE Test Papers class 9 Science Atoms and Molecules. Before appearing in the main examination, candidates must try mock test as it helps the students learn from their mistakes. Law of constant proportions. CBSE Class 9 Chemistry Atoms And Molecules Online Test Set B. Define atomic mass and molecular mass. Class 9 | Science Olympiad Preparation | Weekly practice tests. Atoms of a given element are identical in mass and chemical properties. 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