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After the tremendous success of our last year Important Questions Bank for Tamil Nadu HSC (12th Std) Board Exam 2016, we have also created a list of Most Important Question Bank for Tamil Nadu (12th Std) HSC Board Exam 2017 which are likely to appear in HSC Board Exams this year.
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1.a)Write any three methods of preparation benzylamine
b) Show the formation of a peptide bond with an equation
2. a) Explain optical isomerism involved in tartaric acid.
b)What happens when lactic acid is
(i) treated with dilute H2 SO4
ii) added to PCl 5
iii) Oxidised with alkaline KMnO4
iv) oxidized with Fenton’s reagent
3. a)Write any three methods of preparation benzylamine
b) Show the formation of a peptide bond with an equation
4.a)Explain Pauling scale to determine electronegativity
b) Describe in detail how noble gases are isolated from air?
5. .a) [Cu (NH3 ) 4 ] is square planar, where as [NiCl 4 ] 2- is tetrahedral. Explain
b) Explain the use of radioactive isotopes in the study of reaction mechanism
6. Explain the formation of O2 molecule by molecular orbital theory
7.Explain how dichromate is extracted from its chromite ore.
8.Explain the position of Lanthanides in periodic table.
9. Explain the postulates of Werner’s theory
10. . Define Trouton’s rule. What are the substances that deviate from this rule.
11. .Derive the expressions for Kc and Kp for decomposition of PCl 5 .
12. Distinguish between simple and complex reactions
13. Give any three methods of preparation of diethyl ether.
14. Explain the mechanism of cannizaro reaction
15. Explain the reactions of CH3 CONH2 with
i) P2O5 , ii)Br 2 /NaOH iii) hydrolysis by an acid.
16. Explain briefly on characteristics of rocket propellants
17. Calculate the E.M.F. of the zinc – silver cell at 25oC when [Zn2+] = 0.001M and [Ag+ ] = 0.1 M ( Eo cell at 25oC = 1.56 volt)
18. Out line the classification of carbohydrates giving example for each.
19. . Write brief about the preparation of colloids by Chemical method?
a) Double decomposition As2O3 + 3H2S → As2S3 + 3H2O
b) Oxidation 2H2O + SO2 → 2H2O + 3S
c) Reduction AgNO3 + tannic acid → Ag sol
AuCl3 + tannic acid → Au sol
d) Hydrolysis FeCl3 + 3H2O → Fe(OH)3 + 3HCl
20. Define hybridization
21. Why is HF not stored in silica or glass bottles? Write the equation.
22. Discuss the oxidizing power of fluorine.
23. Why do d-block elements have variable oxidation states?
25. Explain chromyl chloride test with equation?
26. Write a note on molecular crystals.
27. What is equilibrium constant?
28. The half life period of first order reaction is 20 minutes. Calculate the rate constant?
29. .What is Tyndall’s effect?
30. Define molar conductance. Give its unit?
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TN Important Question Bank 2017
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