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Formulation and Calculation, Class 11 Chemistry NCERT Solutions

Some Basic Concepts Of Chemistry Q – 1.7, CBSE Class 11th Chemistry
https://youtube.com/watch?v=_96yHiRqJk4
Some Basic Concepts Of Chemistry Q – 1.9, Class 11th Chemistry
https://youtube.com/watch?v=I2BgjWyGIuk
Some Basic Concepts Of Chemistry Q – 1.10, NCERT Class 11th Chemistry
https://youtube.com/watch?v=r9h-_c_UBDk
Some Basic Concepts Of Chemistry Q – 1.11, CBSE Class 11th Chemistry
https://youtube.com/watch?v=DhX6u9coJXg
Some Basic Concepts Of Chemistry Q – 1.12, Class 11th CBSE Chemistry
https://youtube.com/watch?v=0l_FK0Xtopw

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. Empirical formula of an organic compound is CH and its molecular mass is 78g/mol. What is its molecular formula?
 
 
 
 

Question 1 of 20

2. A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular mass is 92g/mol. The formula of that compound is:
 
 
 
 

Question 2 of 20

3. Which formula represents the simplest whole number ratio of various atoms present in a compound?
 
 
 
 

Question 3 of 20

4. What is the empirical formula of C4H8O2?
 
 
 
 

Question 4 of 20

5. What is the correct formula for calculating the mass % of an element?

2
 
 
 
 

Question 5 of 20

6. The empirical formula of an organic gas containing carbon and hydrogen is CH2. The mass of 1 litre of this organic gas is exactly equal to that of 1 litre of N2. Therefore, the molecular formula of organic compound is:
 
 
 
 

Question 6 of 20

7. Which of the following compounds has the same empirical formula as that of glucose (C6H12O6)?
 
 
 
 

Question 7 of 20

8. The simplest formula of a compound containing 50% of element X (atomic mass = 10g/mol) and 50% of element Y (atomic mass 20g/mol) is:
 
 
 
 

Question 8 of 20

9. Formula mass is applicable in the case of:
 
 
 
 

Question 9 of 20

10. What is the empirical formula of C2H2 and C6H6?
 
 
 
 

Question 10 of 20

11. A compound has an empirical formula of C2HBr. If the molar mass of the compound is 314.7 g/mol, what is the molecular formula of the compound? (Atomic mass of Br = 80g/mol)
 
 
 
 

Question 11 of 20

12. The empirical formula of an acid CH2O2 is:
 
 
 
 

Question 12 of 20

13. What is the mass percentage of carbon in urea [CO(NH2)2]? (Molar mass of urea is 60g)
 
 
 
 

Question 13 of 20

14. An oxide of metal M has 40% by mass of oxygen. Metal M has relative atomic mass of 24g/mol. The empirical formula of the oxide is:
 
 
 
 

Question 14 of 20

15. The empirical formula of a compound is CH2Cl. If the molecular mass of the compound is 99 g, what is the molecular formula of the compound?
 
 
 
 

Question 15 of 20

16. If empirical formula of a compound is C5H4 and the value of n is 2, then molecular formula of the compound is:
 
 
 
 

Question 16 of 20

17. What is the empirical formula of Fe2O3?
 
 
 
 

Question 17 of 20

18. What is the empirical formula of a compound which contains 2.63 moles of N and 3.947 moles of O?
 
 
 
 

Question 18 of 20

19. The number of moles of Cr and O in a compound are 4.8 x 1010 and 9.6 x 1010 respectively. Its empirical formula is:
 
 
 
 

Question 19 of 20

20. Which of the following is the empirical formula for the compound iron(II) carbonate?
 
 
 
 

Question 20 of 20