Class 9 MCQ Questions for Chapter 3 Atoms and Molecules with Answers

We have compiled the MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers Pdf free download covering the entire syllabus for CBSE Class 9 Science. Practice MCQ Questions for Class 9 Science with Answers on a daily basis and score well in exams. Refer to the Atoms and Molecules Class 9 MCQs Quiz Questions with Answers here along with a detailed explanation.

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MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers

MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers

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1. The molecular formula of potassium nitrate is ________.

 
 
 
 

2. The chemical symbol for nitrogen gas is

 
 
 
 

3. How many times an atom of sulphur is heavier than an atom of carbon?

 
 
 
 

4. Percentage of calcium in calcium carbonate is

 
 
 
 

5. The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.

 
 
 
 

6. The chemical symbol for sodium is

 
 
 
 

7. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are

 
 
 
 

8. The molecule having an atomicity of 4 is:

 
 
 
 

9. How many atoms of oxygen are present in 300 grams of CaCO3?

 
 
 
 

10. Which of the following statements is not true about an atom?

 
 
 
 

11. The molecular formula of potassium nitrate is ________.

 
 
 
 

12. Which of the following correctly represents 360 g of water?
(i) 2 moles of H2O
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water

 
 
 
 

13. Which has maximum number of molecules?

 
 
 
 

14. Which of the following has maximum number of atoms?

 
 
 
 

15. A change in the physical state can be brought about

 
 
 
 

16. The molecule having an atomicity of 4 is:

 
 
 
 

17. What is the formula mass unit of ZnO?

 
 
 
 

18. 1 u or 1 amu means

 
 
 
 

19. Which of the following represents a correct chemical formula?

 
 
 
 

20. Which of the following would weigh the highest?

 
 
 
 

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