eVidyarthi

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?
1
 
 
 
 

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?
 
 
 
 

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:
 
 
 
 

Question 3 of 20

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

Question 4 of 20

5. 1 mole of water molecules has:
 
 
 
 

Question 5 of 20

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

Question 6 of 20

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

Question 7 of 20

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

Question 8 of 20

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

Question 9 of 20

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

Question 10 of 20

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

Question 11 of 20

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

Question 12 of 20

13. Calculate the relative molecular mass of H2S.
 
 
 
 

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:
 
 
 
 

Question 14 of 20

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

Question 15 of 20

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

Question 16 of 20

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

Question 17 of 20

18. The formula mass of CaCl2 is:
 
 
 
 

Question 18 of 20

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

Question 19 of 20

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

Question 20 of 20