CBSE Board Class 11 Chemistry Previous Year Question Papers 2009

Previous Paper 
Class 11 

1. Define Buffer solution.  

2. Define solubility product.  

3. When is a solution called unsaturated?   

4. Give an example of acidic buffer?    

5. Ksp for Hg SO4 is 6.4 x 10-5
. What is the solubility of the salt?  

6. How does dilution with water affect the pH of a buffer solution?  

7. Calculate the pH of a buffer solution containing 0.1 mole of acetic acid and
0.15 mole of sodium acetate. Ionisation constant for acetic acid is 1.75 × 10-5

8. Calculate the solubility of Ag Cl (s) in pure water.   

9. Name a basic buffer having pH around 10.   

10. Define half – cell.  

11. Set up an electrochemical cell for the redox reaction 
              Ni 2+ (aq) + Fe(S)  →   Ni(S) + Fe 2+ (aq) 

12. Can we store copper sulphate in an iron vessel?  

13. What is the role of a salt bridge in an electro chemical cell?  

14. An electrochemical cell is constituted by combining Al electrode (E0 = - 1.66v)
and Cu electrode (E0 = + 0.34v). Which of these electrodes will work as cathode and why? 

15. The E0 of Cu2+ / Cu is + 0.34V. What does it signify?  

16. If reduction potential of an electrode is 1.28V. What will be its oxidation
potential?

17. What is the electrode potential of a standard hydrogen electrode?  

18. Which reaction occurs at cathode in a galvanic cell?  

19. Define a redox couple.   
  
20. Why is H2O2 a better oxidant than water?   

21. What happens when H2O2 reacts with acidified KMnO4?  

22. What happens when H2O2 reacts with ethylene?  

23. What do you mean by 100 volume of hydrogen peroxide?  

24. Hydrogen peroxide acts as oxidizing agent as well as a reducing agent. Why?  

25. Why is hydrogen peroxide stored in wax-lined glass or plastic vessels in
dark? 

26. What is the volume strength of 2M-H2O2?    

27. Calculate the strength in volumes of a solution containing 30.36 g/l of H2O2. 

28. What happens when hydrogen peroxide reacts with acidified K2Cr2O7?  

29.  What happens when BaO2 is treated with phosphoric acid?