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MCQ Mole Concept Chapter 3 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 24 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Calculate the number of magnesium ions present in 0.51 g of magnesium chloride?
1

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Question 1 of 24

2. One mole of oxygen atom weighs 16 grams, what will be the mass (in grams) of 0.4 moles of oxygen atoms?

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Question 2 of 24

3. If 12 grams of carbon has n atoms, then the number of atoms in 12 grams of magnesium will be:

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Question 3 of 24

4. What is the value of Avogadro's number?

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Question 4 of 24

5. 1 mole of water molecules has:

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Question 5 of 24

6. How many atoms does one mole of Phosphorus contain?

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Question 6 of 24

7. Which of the following pair of elements represents a mole ratio of 1:1?

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Question 7 of 24

8. The number of moles of oxygen atoms in two moles of nitric acid is:

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Question 8 of 24

9. Identify the symbol used to represent Avogadro's number.

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Question 9 of 24

10. The mass of 0.5 moles of Water molecules is:
(Atomic mass, H =1; O = 16)

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Question 10 of 24

11. The number of moles present in 52g of He(Atomic mass, He = 4) are:

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Question 11 of 24

12. How many atoms are present in SO42- ion ?

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Question 12 of 24

13. Calculate the relative molecular mass of H2S.

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Question 13 of 24

14. If atomic mass of sodium is 23 a.m.u., then the mass of 3.01 x 1023 sodium atoms is:

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Question 14 of 24

15. The atomic mass of calcium is 40. Calculate the number of moles in 16 grams of calcium.

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Question 15 of 24

16. One mole of molecules may not be equal to:

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Question 16 of 24

17. Which of the following is the correct relationship for calculating number of moles?
2

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Question 17 of 24

18. The formula mass of CaCl2 is:

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Question 18 of 24

19. The mass of 6.022 × 1023 number of N2 molecules is:

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Question 19 of 24

20. The numbers of particles present in 69 grams of sodium atoms are:
(Atomic mass, Na = 23)

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Question 20 of 24

21. Assertion : Atomicity of O3 is 3.
Reason : 1 mole of an element contains 6.0221023atoms.

Question 21 of 24

22. Assertion : Number of gram-molecules of SO Cl 2 2 in 13.5 g of sulfuryl chloride is 0.1.

Reason : Gram molecular mass is equal to one gram molecule.

Question 22 of 24

23. Assertion : Atomic mass of aluminium is 27.
Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.

Question 23 of 24

24. Assertion: The number of particles present in one mole of a substance is fixed.
Reason: The mass of one mole of a substance is equal to its relative atomic mass in grams.

Question 24 of 24

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