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?

A

B

C

D

Your comments:

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?

40 grams

32 grams

16 grams

6.4 grams

Your comments:

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:

2n

3n

n/2

n

Your comments:

Question 3 of 24

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

12.044 x 10²²

6.022 x 10²³

3.011 x 10²³

6.022 x 10²²

Your comments:

Question 4 of 24

5. 1 mole of water molecules has:

2 moles of oxygen atoms

1 mole of hydrogen atom

2 moles of hydrogen atoms

2 moles of hydrogen molecule

Your comments:

Question 5 of 24

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

2× 6.022 × 10²³ atoms

3× 6.022 × 10²³ atoms

6.022 × 10²³ atoms

4 × 6.022 × 10²³ atoms

Your comments:

Question 6 of 24

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

20 g of sodium and 20 g of calcium

7 g of nitrogen and 12 gm of sodium

10 g of calcium and 6 g of carbon

14 g of nitrogen and 24 g of magnesium

Your comments:

Question 7 of 24

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

2

4

8

6

Your comments:

Question 8 of 24

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

M_A

A_O

A_N

N_A

Your comments:

Question 9 of 24

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

27 g

0.5 g

9 g

18 g

Your comments:

Question 10 of 24

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

13

2

8

4

Your comments:

Question 11 of 24

12. How many atoms are present in SO₄^2- ion ?

4 atoms

5 atoms

3 atoms

2 atoms

Your comments:

Question 12 of 24

13. Calculate the relative molecular mass of H₂S.

16 a.m.u.

64 a.m.u.

18 a.m.u.

34 a.m.u.

Your comments:

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:

11.5 kg

23 g

0.5 mol

11.5 g

Your comments:

Question 14 of 24

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

0.4 mole

4 mole

1/4 mole

640 mole

Your comments:

Question 15 of 24

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

6.022 x 10²³ number of molecules

Given number of particles (N)

Avogadro number

Molecular mass in grams

Your comments:

Question 16 of 24

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

A

B

C

D

Your comments:

Question 17 of 24

18. The formula mass of CaCl₂ is:

75.5 u

111 u

71 u

115.5 u

Your comments:

Question 18 of 24

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

14

12

24

28

Your comments:

Question 19 of 24

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

18.066 x 10²³

6.022 x 10²³

3.011 x 10²³

12.044 x 10²³

Your comments:

Question 20 of 24

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

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

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.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

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.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

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.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 24 of 24

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