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CHEMISTRY –EXPECTED PAPER-I - MARCH 2014 Time allotted : 3 hours

PART-I (Choose the correct answer) 1. E n = 313.6/n2, If the value of Ei = -34.84 to which value „n‟ corresponds a) 4 b) 3 c) 2 d) 1 2. The hybridisation in SF6 molecule is a) sp3 b) sp3d2 c) sp3d d) sp3d3 3. Noble gases have _____electron affinity a) High b) Low c) Zero d) Very low 4. The compound used as smoke screen a) PCl3 b) PCl5 c) PH3 d) H3PO3 5. Which transition element show highest oxidation State? a) Sc b) Ti c) Os d) Zn 6. Lanthanides are separated by a) Fractional distillation b) Steam distillation c) Fractional Crystallisation d) Sublimation 7. The most common oxidation state of lanthanides is a) +2 b) +1 c) +3 d) +4 9. An example of an ambidentate ligand is a) CNb) Clc) NO2 d) I235 10. 92U nucleus absorbs a neutron and disintegrates into 54Xe139, 38Sr94 and x. What will be the product x? a) 3 neutrons b) 2 neutrons c) particle d) -particle 11. An example for Frenkel defect is a. NaCl b. AgBr c. CsCl d. Fes 12. Change is Gibb‟s free energy is given by a. △G = △H+T△S b. △G =△ H-T△S c. △G =△ Hx T△S d. none of these 13. In which of the following process, the process is always non-feasible? a) H > 0, S > 0 b) H < 0, S > 0 c) H > 0, S < 0 d) H < 0, S < 0 14. In the reversible reaction 2HI H2 + I2, Kp is a) greater than Kc b) less than Kc c) Equal to Kc d) Zero 15. Forward reaction takesplace when a. QKc c. Q = Kc d. Kc = 1/Q 16. The excess energy which a molecule must posses to become active is known as (a) kinetic energy (b) threshold energy (c) potential energy (d) activation energy 17. The migration of colloidal particles under the influence of an electric field is known as (a) electroosmosis (b) cataphoresis (c) electrodialysis (d) electrophoresis 18 An emulsion is a colloidal solution of (a) two solids (b) two liquids (c) two gases (d) one solid and one liquid

Maximum marks : 150

19. Catalyst used in Deacon‟s method of manufacture of chlorine is a. NO b. CuCl2 c. Fe2O3 d. Ni 20. When pH of a solution is 2, the hydrogen ion concentration in moles litre-1 is ............. (a) 1 x10–12 (b) 1 x10–2 (c) 1 x10–7 (d) 1 x10–4 21. Ethylene diamine is converted to ethylene glycol using (a) Na2CO3 solution (b) nitrous acid (c) NaHCO3 (aqueous) (d) Baeyer‟s reagent 22. Intermolecular hydrogen bonds are not present in (a) CH3-COOH (b) C2H5-O-C2H5 (c) CH3-CH2-OH (d) C2H5-NH2 23 Diethyl ether can be decomposed with (a) HI (b) KMnO4 (c) NaOH (d) H2O 24 Tollen‟s reagent is (a) ammoniacal cuprous chloride (b) ammoniacal cuprous oxide (c) ammoniacal silver nitrate (d) ammoniacal silver chloride 25.CH3CH(OH)COOH  ? The product is H2O2/Fe2+ (a) CH3COCOOH (b) CH3CH2COOH (c) CH3CHOHCHO (d) COOHCH2COOH 26 Which of the following will not undergo diazotisation (a) m-toluidine (b) aniline (c) p-amino phenol (d) benzyl amine 27. Nitromethane condenses with acetaldehyde to give (a) nitro propane (b) 1-nitro-2-propanol (c) 2-nitro-1-propanol (d) 3-nitro propanol

28 Which of the following compounds has the smell of bitter almonds ? (a) aniline (b) nitro methane (c) benzene sulphonic acid (d) nitrobenzene 29. The amino acid without chiral carbon is (a) Glysine (b) Alanine (c) Proline (d) Thyrosine 30. When starch is heated to 200-250oC , the product is a. Dextrin b. Caramel c. Barley sugar d. cellulose PART-II (Answer any fifteen)

31. What is the significance of negative electronic energy. 32. Electron affinity of Beryllium and nitrogen are Almost zero why? 33. Show that P2O5 is powerful dehydrating agent. 34. Why is the HF not stored in silica or glass

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bottles? Write the equation. 35. Why is transition elements form complexes. 36. Explain Mn2+ is more stable than Mn3+ . 37. Explain the principle behind the “ Hydrogen bomb”. 38. Write a note on molecular crystal.give an example. 39. State Trouton‟s rule. 40. Define reaction quotient. How it is related to equilibrium constant? 41. Derive an equation for the half-life period of a first order reaction. 42. What is pseudo order reaction ? Give an example. 43. What are promoters? Give an example. 44. What do you understand by buffer solutions? 45. Distinguish enatiomers and diastereomers. 46. What happens when glycerol reacts with KHSO4. 47. How is ethylene glycol converted into dioxan 48. What is urotrophine? Give its use. 49. What is trans esterification? M‟06 50. An aromatic primary amine A with molecular formula C6H7N undergoes diazotization to give B. B when treated with hypophosphorous acid gives C. Idendify A,B and C . 51. Why are iodiform and phenolic solutions called antiseptic? PART-III SECTION-A 52. Explain the formation of N2 molecules by MO orbital theory. 53. How Potassium dichromate is prepared? 54. Describe the extraction of Lanthanides from monazite sand. 55. Discuss a. coordination isomerism and b. ionization isomerism with ex. SECTION-B 56. Write the chacteristics of entropy. 57. Derive the relation Kp=Kc (RT)△ng for a general chemical equilibrium. 58. Explain various types of complex reactions and give one example of each. 59. Calculate the emf of the cell having cell reaction 2Ag+ + Zn == 2 Ag + Zn2+ EoCell =1.56 at 25oC When the concentration of Zn2+ =0.1M and Ag+ = 10M in the solution. SECTION-C 60. Give any two methods of preparation of anisole

and explain the reaction of HI with anisole. 61. Explain the mechanism of Cannizzaro‟s reaction. 62. Explain i. Kolbe‟s electrolytic reaction and ii. Trans –esterification reaction. 63. Write briefly the characteristics of rocket propellants. PART-IV (Answer any Four. Q-70 is compulsory )

64.a. Explain Pauling‟s method to determine ionic radii? b. Describe in detail how noble gases are isolated by Dewar‟s process. 65.a. Explain the postulates of Werner‟s theory . b. How are radio active isotopes useful in medicine. 66.a. Explain Bragg‟s spectrometer method. b. Write briefly on intermediate compound formation theory of catalysis with an example. 67.a. Explain Ostwald‟ s dilution law. b. Derive Nernst equation. 68.a. Discuss the optical isomerism in tartaric acid. b. How are the conversions are carried out? i. Salicylic acid  aspirin ii. Methyl salicylate  ethyl acetate iii. Lactic acid  pyruvic aicd. 69.a. Discuss the reduction of nitrobenzene in various medium. b. Prove the structure of glucose. 70. a. 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 A.B.C and D and explain the reactions. b. The metal (B) is extracted from the ore (A). On treatment with dil. Nitric acid metal (B) gives a compound (C) , which is also known as Lunar Caustics. The compound C on treatment with KI gives a yellow precipitate (D). Find A,B,C and D and explainthe reactions. (OR) c. Compound A with molecular formula C7H6O reduces Tollen‟s reagent and also gives Cannizzaro‟s reaction. A on oxidation gives the compound B with molecular formula C7H6O2. Calcium salt of B on dry distillation gives the compound C with molecular

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formula C13H10O. Find A , B and C. Explain the reactions. d. Calculate pH of 0.1M CH3-COOH solution . Dissociation constant of acetic acid 1.8 x 10-5. Prepared by K. RAVI GANESH,M.Sc., B.Ed., CHEMISTRY RESOURCE TEACHER EDUCATOR MADURAI -20