Tamilnadu Board Class 12 Chemistry Sample Papers 2011


Tamilnadu Board Sample Papers 2011 for Class 12 Chemistry


Sample Question Paper

CHEMISTRY

Class 12

1. State Heisenberg’s uncertainity principle.

2. Mention the disadvantage of Pauling Scale.

3. What is plumbo solvency.

4. Write the uses of Neon.

5. Why transition elements form complexes?

6. What is the action of heat on copper sulphate crystals?

7. How many  α and  β  particles will be emitted by an element 84 A218 is changing to a stable isotope of 82 B 206 ?

8. What are superconductors?

9. Calculate the change of entropy for the process, water (liquid) water (vapour 373K) involving ∆  H (vap) = 40850J mol -1
373K

10. State Lechatlier’s principle.

11. Define half life period.

12. What are simple and complex reactions?

13. Why colloidal system of gas in gas does not exist?

14. State Faraday’ s first law.

15. Distinguish enantiomers and diastereomers.

16. How is phenolphthalein prepared?

17. Explain the synthesis of glycerol from  propylene.

18. Formaldehyde and benzaldehyde give Cannizzaro reaction but acetaldehyde does not account for this?

19. Formic acid reduces Tollen’s reagent, but acetic acid does not. Give reason.

20. An organic compound (A) having molecular formula C 2 H7 N is treated with nitrous acid to give (B) of molecular formula C 2 H6 O which on mild oxidation gives compound (C) of molecular formula C 2 H4 O which answers Tollens reagent test.  Identify A, B, C.

21. Ilustrate with suitables the term ‘Anaesthetics’.1 0

PART - III
Note : (7 x 5 = 35)
(i) Answer any Seven questions choosing at least two questions from each section.

Section - A

22 . The approximate mass of  an elect ron  is 10 -27 g.Calculate the uncertainty in its velocity.If the the uncertainity in its position were of the order of 10 -11 m.

23. Explain the extraction of silver from its chief ore.

24. What is Ianthanide contraction? Discuss its consequences.

25. Explain Co-ordination isomerism and ionisation isomerism with suitable examples.

Section - B

26. In the thermal decomposition of N 2 O at 764°C, the time required to decompose half of the reactant was 263 seconds, when the initial pressure was 290 mm of Hg and 212 seconds at an initial pressure of 360 mm of Hg. What is the order of this reaction?

27. State the various statements of second law of Thermodynamics.

28. Derive the integrated Van’t Hoff equation for an equilibrium reaction.

29. Derive Nernst equation.

Section - C

30. Distinguish between aromatic and aliphalic ethers.

31. Write notes on
i) Perkin’s reaction and
ii) Knoevenagal reaction

32. Discuss the mechanism of bromination of salicyclic acid.

33. Explain briefly on characteristics of rocket propellants.

PART- IV
(4 x 10 = 40)
Note :  Answer question number 70 and any three from the remaining questions.

34. (a) Write notes on Pauling’s and Mulliken’s Scale of Electronegativity. [5]
(b) Give an account of the structure of ortho and cyclic silicates. [5]

35. (a) Explain Werners theory of coordination compounds. [5]
(b) Explain the uses of radioactive isotopes with examples. [5]

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