Guess Paper – 2011
Class – XII
Subject – Chemistry
1. In what kind of defect density of crystal increases.
2. Why N2 is less reactive than P4?
3. Draw the structure of semicarbazone of cyclobutanone.
4. Why is sulphuric acid not used during the reaction of alcohols with ki?
5. When NaBr is heated with conc H2SO4 ,Br2 is produced but when NaCl is heated with Conc H2SO4, HCl is produced. Why?
6. What is an azeotrope?
7. Define limiting molar conductivity .
8. Ortho-sulphobenzimide is used in the preparation of sweet for a diabetic person or patient, why ?
9. Intrinsic colloids are reversible also. Comment.
10. Write down the structure of 2-(2-Chlorophenyl)-1-iodooctane.
11. State what are enantiomers.
12. What is the significance of leaching in the extraction of aluminium ?
13. Why is NH3 the strongest base amongst all the hydrides of group 15 members?
14. Which is a better nucleophilic addition reaction HCHO or C6H5CHO?
15. Write IUPAC name of the following compound: CH3COCOCH = CH-CONH-CH3
16. What are solvate isomerim?
17. Write Clemenson reduction.
18. How you can distinguish between phenol and benzyl alcohol?
19. What is the covalence of nitrogen in N2O5?
20. Name the macromolecules that are chosen as drug targets.
21. Can you store copper sulphate solution in a zinc pot?
22. PCl5 is ionic in the solid state. Why?
23. Give one test to distinguish whether the given emulsion is oil in wtaer type or water in oil type emulsion.
24. Grignard reagents should be prepared under anhydrous conditions, Why?
25. Why heat of chemisorption is always more than that of physisorption ?