CBSE Class 11 Chemistry Sample Paper Set 5

1. How many significant figures are present in the following?

       a) 0.0025               b) 208         c) 5005                

       d) 126,000             e) 2.0034 

2. Why liquids diffuse slowly compared to gases? 

3. What happens if a liquid is heated to the critical temperature of its vapour? 

4. Name the factors that do not affect the valence shell. 

5. Name the groups of elements classified as s, p and d-blocks. 

6. A piece of burning Mg keeps on burning in a jar of sulphur dioxide. Why? 

7. Suggest a reason as to why CO is poisonous in nature. 

8. Why boric acid is polymer?

9. What are electron deficient compounds? Are BCl₃ and SiCl₄ electron deficient species? Explain. 

10. Arrange the following in the order of increasing hydrogen bonding strength – O, F, S, N, Cl. 

11. How do atomic radii vary in a period and in a group? Explain the variation. 

12. List the important postulates of kinetic theory of gases. 

13. Give the important ores of sodium and potassium. 

14. If mass of air at sea level is 1034 g/cm², then calculate the pressure in pascal. [1Pa = 1Nm^-2]. 

15. Justify by giving reactions that fluorine is the best oxidant and hydroiodic acid is the best reductant. 

16. What is the lowest value of ‘n’ that allows ‘g’ orbitals to exist? 

17. An electron is in one of the 3d orbitals. Give the possible values of n, l and m for this electron. 

18. Predict the acidic, basic or neutral nature of the solutions of: NaCl, KBr, NaCN, NH₄NO₃, NaNO₂, KF. 

19. Benzene contains 3 double bonds yet it behaves as saturated compound. Explain.