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. Percentage of calcium in calcium carbonate is

 
 
 
 

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

 
 
 
 

3. 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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. The chemical symbol for sodium is

 
 
 
 

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

 
 
 
 

9. The molecule having an atomicity of 4 is:

 
 
 
 

10. Which has maximum number of molecules?

 
 
 
 

11. What is the formula mass unit of ZnO?

 
 
 
 

12. 1 u or 1 amu means

 
 
 
 

13. The chemical symbol for nitrogen gas is

 
 
 
 

14. Which of the following would weigh the highest?

 
 
 
 

15. The molecular formula of potassium nitrate is ________.

 
 
 
 

16. The molecule having an atomicity of 4 is:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

19. The molecular formula of potassium nitrate is ________.

 
 
 
 

20. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are

 
 
 
 

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