Mole Concept, Class 9 Science

1. There will be total 20 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

Question 1 of 20

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

Question 2 of 20

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

Question 3 of 20

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

Question 4 of 20

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

Question 5 of 20

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

Question 6 of 20

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

Question 7 of 20

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

 2

 4

 8

 6

Question 8 of 20

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

 M_A

  A_O

 A_N

  N_A

Question 9 of 20

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

Question 10 of 20

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

 13

 2

 8

 4

Question 11 of 20

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

 4 atoms

 5 atoms

 3 atoms

 2 atoms

Question 12 of 20

13. Calculate the relative molecular mass of H₂S.

 16 a.m.u.

 64 a.m.u.

  18 a.m.u.

 34 a.m.u.

Question 13 of 20

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

Question 14 of 20

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

Question 15 of 20

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

Question 16 of 20

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

 A

 B

 C

 D

Question 17 of 20

18. The formula mass of CaCl₂ is:

 75.5 u

 111 u

 71 u

 115.5 u

Question 18 of 20

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

 14

 12

 24

 28

Question 19 of 20

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

Question 20 of 20

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