These MCQ's are extremely critical for all CBSE students to score better marks. Define law of conservation of mass. Description. April 8, 2020 by physicscatalyst 4 Comments. Multiple Choice Questions (MCQ) for Atoms and Molecules - CBSE Class 9 Chemistry on Topperlearning. Getting ready for that end year exam? The mass of 2.5 gram atoms of calcium is _______. Online Test for Class 9 Chemistry Atoms and Molecules . How ? This mock test of Atoms & Molecules - Practice Test, Class 9 Science for Class 9 helps you for every Class 9 entrance exam. Define atomic mass and molecular mass. Welcome! Questions from all the topics are covered in the solutions. Atoms and Molecules. The quantity of matter present in an object is called its _________. There are a total of 44 questions, This is a 30 min test. Which of the following does not represent molar mass of a substance? You can finish this test any time using the 'Submit' button. Molecules without a charged valency are contained by only? 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