CBSE Board Class 11 Chemistry Previous Year Question Papers 2010

Previous Paper 
Class 11
 
1. Mention the main compounds which constitute Portland cement.  

2. Give two uses of 
(i) caustic soda 
(ii) quick lime 

3. What is quick lime? What happens when we add water to it?  

4. What happens when gypsum is heated to 390K? 

5. Anhydrous calcium sulphate  can not be used as plaster of Paris. Give reason.  

6. What is the formulae of caustic potash?   

7. Mention the natural sources of calcium carbonate.   

8. What is milk of lime?   

9.  What happens when CaCO3 is subjected to heat?  

10. Show with an example that Ca O is a basic oxide?  
  
11. What is water gas?   

12. Why is CO considered poisonous ?   

13. Silicon dioxide is treated with hydrogen fluoride. Explain? 

14. What are silicones?   

15. What is dry ice?   

16. What are silicates?   

17. How are silicones manufactured?   

18. Write the resonance structures of carbon dioxide.  

19. Why does CO2 have a linear shape with no dipole moment  

20. What is silica-gel used as?   

21. In which C – C bond of CH3CH2CH2Br, the inductive effect is expected to be the
least? 

22. Can you use potassium in place of sodium for fusing an organic compound in
Lassaigne’s test? 

23. Can you use calcium in place of sodium for fusing an organic compound?  

24. 0.395 g of an organic compound by Carius method  for the estimation of
sulphur gave 0.582 g of BaSO4. Calculate the percentage of sculpture in the
compound. 

25. 0.40g of an organic compound gave 0.3g of Ag Br by Carious method. Find the
percentage of bromine in the compound. 

26. 0.12g of organic compound containing phosphorus gave 0.22g of Mg2P2O7 by
the usual analysis. Calculate the percentage of phosphorus in the compound. 

27. Ammonia produced when 0.75g of a substance was kjeldahlized, neutralized
30cm3
of 0.25 N H2SO4. Calculate the percentage of nitrogen in the compound. 

28. Write the chemical composition of the compound formed when ferric chloride
is added containing both N and S.