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MCQ Basic Units of Matter Chapter 3 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. What are the building blocks of matter?

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Question 1 of 14

2. How do atoms usually exist in nature?

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Question 2 of 14

3. Which atom is the smallest atom of all?

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Question 3 of 14

4. Which of the following can be used to see atoms?

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Question 4 of 14

5. The number of atoms present in one molecule of an element is called as:

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Question 5 of 14

6. Out of the following, which one is an example of a molecule of a compound?

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Question 6 of 14

7. Cl2 stands for:

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Question 7 of 14

8. Which constituent of air is monoatomic?

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Question 8 of 14

9. Molecules can exist in free state because:

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Question 9 of 14

10. Which is the smallest particle of an element that can take part in a chemical reaction?

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Question 10 of 14

11. Assertion: Atoms always combine to form molecule and ions.
Reason: Atoms of most element are not able to exist independently.

Question 11 of 14

12. Assertion: Atomicity of ozone is three while that of oxygen is two.

Reason: Atomicity is the number of atoms constituting a molecule.

Question 12 of 14

13. Assertion : Molecular weight of oxygen is 16.
Reason : Atomic weight of oxygen is 16.

Question 13 of 14

14. Assertion : The number of moles of He in 52 g of He is 13.
Reason : The number of moles of an atom is the ratio of its given mass to its molar mass.

Question 14 of 14

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