Atomic Mass and Molecular MassPractice Questions & MCQs
Practice Atomic Mass and Molecular Mass questions from Atoms and Molecules (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Atomic Mass and Molecular MassQuiz - Solve & Score
Q1. A lab technician weighs out pure glucose C6H12O6 for a respiration demo. What is the molecular mass of C6H12O6 in u?
- A.169
- B.29
- C.179
- D.180
Answer: D. 180
Add atomic masses for every atom: 6x12 + 12x1 + 6x16 = 180 u.
Q2. A chemist dissolves table salt NaCl to prepare a saline solution. Summing the atomic masses of every constituent atom, what molecular mass does NaCl have, in u?
- A.81.5
- B.59.5
- C.35.5
- D.58.5
Answer: D. 58.5
Add atomic masses for every atom: 1x23 + 1x35.5 = 58.5 u.
Q3. A gardener checks the label on a bag of urea CO(NH2)2 fertiliser. What does one formula unit of molecular mass weigh on the relative atomic-mass scale, giving its CO(NH2)2 in u?
- A.60
- B.57
- C.59
- D.43
Answer: A. 60
Add atomic masses for every atom: 1x12 + 1x16 + 2x14 + 4x1 = 60 u.
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Where can I practise Atomic Mass and Molecular Mass questions for Class 9 Science?
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Are these Atomic Mass and Molecular Mass questions important for the exam?
Yes. These Atomic Mass and Molecular Mass important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
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