Class 9 Atoms and Molecules MCQ Quiz Set 1

MCQ Quiz – 1 MCQ Quiz – 2 Notes Important Questions NCERT Solutions

Atoms and Molecules Quiz – 1

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1. All samples of carbon dioxide contain carbon and oxygen in the mass ratio 3:8 this is in agreement with the law of

 
 
 
 

2. According to the law of definite proportions, ________.

 
 
 
 

3. What is the mass of grams of 3 moles of N ?

 
 
 
 

4. The number of atoms present in a one molecule of a substance is called

 
 
 
 

5. The atomic mass of sodium is 23. The number of moles in 46 g of sodium is

 
 
 
 

6. Identify the correct one from the following statements.

 
 
 
 

7. How many grams of sodium will have the same number of atoms as 6 grams of magnesium ? (Na =23 , Mg =24)

 
 
 
 

8. Molecular mass is defined as the

 
 
 
 

9. How many times an atom of sulphur is heavier than an atom of carbon?

 
 
 
 

10. The molecule having an atomicity of 4 is:

 
 
 
 

11. The density of liquid mercury is 13.6 g/cm3  How many moles of mercury are there in 1 litre of the metal ? (atomic mass of Hg = 200)

 
 
 
 

12. What is the latin name of sodium?

 
 
 
 

13. Which of the following represents 12 u?

 
 
 
 

14. Which of the following has maximum number of atoms ?

 
 
 
 

15. How many moles are present in 560 g of iron?

 
 
 
 

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