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  #2  
22nd August 2014, 08:32 AM
Super Moderator
 
Join Date: Apr 2013
Re: Tamilnadu Board Class 12 Chemistry Exam Paper

Here I am providing the list of few questions of Tamilnadu Board Class 12 Chemistry Exam Paper for your idea.

1. En = -313.6/n2, If the value of Ei = -34.84 to which value ‘ n’ corresponds to
(a) 4 (b) 3 (c) 2 (d) 1
2. The bond order of nitrogen molecule is
(a) 2.5 (b) 3 (c) 2 (d) 4
3. Noble gases have _____ electron affinity
(a) High (b) Low (c) Zero (d) Very low
4. The shape of XeF4 is
(a) Tetrahedral (b) Octahedral
(c) Square planar (d) Pyramidal
5. Copper is extracted from
(a) Cuprite (b) Copper glance
(c) Malachite (d) Copper Pyrites
6. Silver salt used in photography is
(a) AgCl (b) AgNO3 (c) AgF (d) AgBr
7. The most common oxidation state of Lanthanides is
(a) +2 (b) +1 (c) +3 (d) +4
8. ________ is used in gas lamp material
(a) MnO2 (b) CeO2 (c) N2O5 (d) Fe2O3
9. The geometry of [Ni(CN)4]2- is
(a) Tetrahedral (b) Square Planar (c) Triangular (d) Octahedral
10. Which of the following is used as neutron absorber in nuclear reactors?
(a) Water (b) Deuterium (c) Uranium (d) Cadmium
11. The number of chloride ions present per unit of CsCl
(a) 6 (b) 8 (c) 1 (d) 4
8
12. In an adiabatic process which of the following is correct?
(a), q=w (b) q=0 (c) E=q (d) PV=0
13. When a liquid boils, there is
(a) an increase in entropy (b) a decrease in entropy
(c) an increase in heat of vapourisation
(d) an increase in free energy
14. State of Chemical equilibrium is
(a) Dynamic (b) Stationary (c) Both a&b (d) None
15. For an endothermic equilibrium reaction, if K1 and K2 are the equilibrium constants at T1 and T2 temperatures
respectively and if T2>T1, then
(a) K1 < K2 (b) K1>K2 (c) K1 = K2 (d) None
16. The unit of zero order rate constant is
(a) sec-1 (b) mol lit-1 sec-1
(c) mol sec-1 (d) lit2 sec-1
17. Oil soluble dye is mixed with emulsion and emulson remains colorless then, the emulsion is
(a) O/W (b) W/O (c) O/O (d) W / W
18. Colloids are purified by
(a) precipitation (b) Coagulation (c) Dialysis (d) Filtration
19. Fe(OH)3 colloidal particles adsorb _______ ions
(a) Fe3+ (b) Mg2+ (c) Ca2+ (d) Cu2+
20. Ostwald’s dilution law is applicable to the solution of
(a) CH3COOH (b) NaCl (c) NaOH (d) H2SO4
21. The reaction of Lucas reagent is fast with
(a) ethanol (b) methanol (c) 2-propanol (d) 2-methyl 2-propanol
22. An organic compound C4H10O when heated with excess HI gives only one type of alkyl iodide. The
Compound is
(a) diethylether (b) methyl n-propylether
(c) methyl iso propyl ether (d) n-butyl alcohol
23. When ether is exposed to air for sometime an explosive substance produced is
(a) Peroxide (b) Oxide (c) TNT (d) Superoxide
24. The compound that does not undergo Cannizzaro reaction is
(a) Formaldehyde (b) Acetaldehyde
(c) Benzaldehyde (d) Trimethyl Acetaldehyde
25 . Which of the following is least acidic?
(a) C2H5OH (b) CH3COOH (c) C6H5OH (d) ClCH2COOH
26. Nitration of nitrobenzene results in
(a) O-dinitro benzene (b) 1,3,5-trinitro benzene
(c) p-dinitrobenzene (d) m-dinitrobenzene
27. Primary amine acts as
(a) Electrophile (b) Lewis base (c) Lewis acid (d) Free radical
9
28. Which of the following will not undergo diazotisation?
(a) m-toluidine (b) aniline (c) p-amino phenol (d) benzylamine
29. Important constituent of cell wall is
(a) Lipid (b) Cellulose (c) Protein (d) Vitamin
30. The most abundant carbohydrate is
(a) glucose (b) fructose (c) starch (d) cellulose
PART-II
Note : (15X3 = 45)
(i) Answer any 15 questions.
(ii) Answer in one or two sentences :
31. State Heisenberg’s uncertainity principle.
32. Mention the disadvantage of Pauling Scale.
33. What is plumbo solvency.
34. Write the uses of Neon.
35. Why transition elements form complexes?
36. What is the action of heat on copper sulphate crystals?
37. How many and particles will be emitted by an element 84A218 is changing to a stable isotope of
82B206?
38. What are superconductors?
39. Calculate the change of entropy for the process, water (liquid) water (vapour 373K) involvingH(vap) =
40850J mol-1 373K
40. State Lechatlier’s principle.
41. Define half life period.
42. What are simple and complex reactions?
43. Why colloidal system of gas in gas does not exist?
44. State Faraday’ s first law.
45. Distinguish enantiomers and diastereomers.
46. How is phenolphthalein prepared?
47. Explain the synthesis of glycerol from propylene.
48. Formaldehyde and benzaldehyde give Cannizzaro reaction but acetaldehyde does not account for this?
49. Formic acid reduces Tollen’s reagent, but acetic acid does not. Give reason.
50. An organic compound (A) having molecular formula C2H7N is treated with nitrous acid to give (B) of
molecular formula C2H6O which on mild oxidation gives compound (C) of molecular formula C2H4O which
answers Tollens reagent test. Identify A, B, C.
51. Ilustrate with suitables the term ‘Anaesthetics’.
PART - III
Note : (7 x 5 = 35)
(i) Answer any Seven questions choosing at least two questions from each section.
Section - A
52. The approximate mass of an electron is 10-27g. Calculate the uncertainty in its velocity. If the the
uncertainity in its position were of the order of 10-11m.
53. Explain the extraction of silver from its chief ore.
54. What is Ianthanide contraction? Discuss its consequences.
55. Explain Co-ordination isomerism and ionisation isomerism with suitable examples.
Section - B
56. In the thermal decomposition of N2O 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?
57. State the various statements of second law of Thermodynamics.
58. Derive the integrated Van’t Hoff equation for an equilibrium reaction.
59. Derive Nernst equation.
Section - C
60. Distinguish between aromatic and aliphalic ethers.
61. Write notes on
i) Perkin’s reaction and
ii) Knoevenagal reaction
62. Discuss the mechanism of bromination of salicyclic acid.
63. Explain briefly on characteristics of rocket propellants.
PART-IV
(4 x 10 = 40)
64. (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]
65. (a) Explain Werners theory of coordination compounds. [5]
(b) Explain the uses of radioactive isotopes with examples. [5]
66. (a) Write notes on any two point defects in Crystals [5]
(b) Write notes on (i) Ultrafiltration and (ii) Helmholtz double layer [5]
67. (a) Derive Henderson Equation. [5]
(b) Write notes on single electrode potential. [5]
68. (a) Which conformation of cyclohexanol forms intermolecular hydrogen bonding more easily?
Explain. [5]
(b) How are the following conversions carried out?
(i) Salicylic acid aspirin
(ii) Salicyclic acid methylsalicylate
(iii) lacticacid lactide
11
69. (a) How can the following conversions be effected? [5]
i. Nitrobenzene to anisole
ii. Chlorobenzene to phenyl hydrazine
iii. Aniline to Benzoic acid
(b) Mention the biological functions of nucleic acids [5]
70. (a) An organic compound A (C7H6O2) reacts with NH2OH forming a crystalline compound. On warming
with NaOH it forms two compounds B and C. ‘B’ is neither soluble in NaOH nor in HCl but can be
oxidised to A. The compound ‘C on treatment with Con. HCl forms acid ‘D’ which on treating with soda
lime gives ‘phenol’. Identify A to D. [5]
(b) Chief ore of chromium (A) on roasting with Sodium carbonate gives compound (B) and (C). B on
acidification gave compound (D) which on treatment with KCl gave compound (E). Identify the compounds
A, B,C,D and E. Explain with proper chemical reactions. [5]
(OR)
(c) An organic compound A (C6H6O) gives maximum of two isomers B and C when an alkaline solution
of ‘A’ is refluxed with chloroform at 333K. ‘B’ on oxidation gives an acid D. The acid ‘D’ is also obtained
by treating sodium salt of A with CO2 under pressure. Identify the compounds A, B, C and D and
explain with proper chemcial reactions. [5]
(d) Calculate the pH of O.IM CH3COOH Solution Disassociation constant of
acetic acid is 1.8 x 10-5M. [5]
  #3  
16th May 2015, 04:01 PM
Unregistered
Guest
 
Re: Tamilnadu Board Class 12 Chemistry Exam Paper

Can you provide me the previous year question paper of Tamilnadu Board class 12th Chemistry subject as I need it for preparation?
  #4  
16th May 2015, 04:08 PM
Super Moderator
 
Join Date: Apr 2013
Re: Tamilnadu Board Class 12 Chemistry Exam Paper

The previous year question paper of Tamilnadu Board class 12th Chemistry subject as you need it for preparation is as follws:








Tamilnadu Board Class 12 Chemistry Syllabus

Inorganic Chemistry
Atomic Structure II
Periodic Table
p – block elements
d – block elements
f – block elements
Co-ordination compounds &
bio co-ordination compounds
Nuclear Chemistry
Physical Chemistry
Solid state
Thermodynamics II
Chemical equilibrium II
Chemical Kinetics II
Surface Chemistry
Electro chemistry I
Electro chemistry II
Organic Chemistry
Isomerism in Organic Chemistry
Hydroxy derivatives
Ethers
Carbonyl Compounds
Carboxylic acid
Organic Nitrogen Compounds
Bio molecules
Chemistry in Action
Problems in Chemistry
Attached Files
File Type: pdf Tamilnadu Board Class 12 Chemistry Exam Paper.pdf (2.36 MB, 229 views)


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