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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