1. UPSEEPAST PAPERCHEMISTRY- UNSOLVED PAPER - 2003

2. SECTION I (Total Marks :50) Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them iscorrect. Indicate you choice of the correct answer for each part in your answer-book bywriting the letter (a), (b), (c) or (d) whichever is appropriate 3. 01 Problem The hybridization of carbon atom in benzene is : a. sp b. sp2 c. sp3 d. dsp2 4. 02 Problem Compound which gives acetone on ozonolysis : a. CH3 CH = CH CH3 b. (CH3)2C = C (CH3)2 c. C6H5CH = CH2 d. CH3CH= CH2 5. 03 Problem p-chloro aniline and anilinium hydrogen chloride can be distinguished by : a. Sandmeyer reaction b. Carbyl amine reaction c. Hinbergs reaction d. AgNO3 6. 04 Problem In alumino thermic process, aluminium acts as : a. Oxidant b. Flux c. A readucing agent d. A solder 7. 05 Problem Mn2+ can be converted into Mn7+ by reacting with : a. SO2 b. Cl2 c. PbO2 d. SnCl2 8. 06 Problem A compound is treated with iodine and an alkali. It gives a yellow ppt. The compound is? a. Propionaldehyde b. Benzophenone c. Methyl acetate d. Acetophenone 9. 07 Problem Phenol is less acidic than : a. Acetic acid b. p-methoxy phenol c. acetylene d. ethanol 10. 08 Problem Which reaction is not affected by change in pressure ? a. H2 + I2 2HI b. 2C + O 2CO 2 c. N2 + 3H2 2NH3 d. PCl5 PCl3 + Cl2 11. 09 Problem Which of the following does not show Cannizaro reaction ? a. CH3CHO b. HCHO c. C6H5CHO d. (CH3)3C . CHO 12. 10 Problem Oxidation state exhibited by chromium is given a. + 6 b. + 4 c. 0 d. all of these 13. 11 Problem Electronic configuration of chromium is given by : a. [Ar]3d4, 4s2 b. [Ar]3d5, 4s1 c. [Ar]3d3, 4s2 d. none of these 14. 12 Problem Benzene can react with : a. Bromine water b. HNO3 c. H2O d. CH3OH 15. 13 Problem Hydrogen boding is maximum in : a. C2H5OH b. CH3OCH3 c. (CH3)2C = O d. CH3CHO 16. 14 Problem Which of the following is non-metallic ? a. B b. Be c. Mg d. Al 17. 15 Problem The compound not soluble in acetic acid is : a. CaCO3 b. CaO c. CaC2O4 d. Ca(OH)2 18. 16 Problem Rate constant for a reaction is 10-3 s-1. Time to leave 25% reaction is : a. 693 s b. 1386 s c. 6930 s d. 2029 s 19. 17 Problem A compound does not react with 2, 4 dinitrophenyl hydrazine, compound is : a. Acetone b. Acetaldehye c. CH3OH d. CH3CH2COCH3 20. 18 Problem A meta directing functional group is : a. - COOH b. - OH c. - CH3 d. - Br 21. 19 Problem Which of the following is paramagnetic ? a. O2+ b. CN c. CO d. N2 22. 20 Problem 1, 2-dibromo cyclohexane on dehydrogenation gives : a. b. c. d. none of these 23. 21 Problem Correct increasing order of first ionization potential is : a. Na < Mg > Al < Si b. Na < Mg < Al < Si c. Na > Mg > Al > Si d. Na < Mg < Al > Si 24. 22 Problem If enthalpies of methane and ethane are respectively 320 and 560 cal, then the bond energy of C C bond is : a. 60 cal b. 80 cal c. 40 cal d. 120 cal 25. 23 Problem A hydrocarbon contains 10.5 g carbon and 1 g hydrogen. Its 0.3 g has 1 L volume at 1 atm and 1270C, hydrocarbon is : a. C6H7 b. C7H8 c. C5H6 d. None of these 26. 24 Problem How many bonding electron pairs are there is white phosphorus ? a. 6 b. 12 c. 4 d. 8 27. 25 Problem Addition of HBr two propylene in presence of benzoyl peroxide, follows : a. Markownikoffs rule b. Baeyers rule c. Carbanion mechanism d. Anti-markownikoffs rule 28. 26 Problem On adding a solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is : a. 0.25 b. 0.75 c. 0.50 d. 0.33 29. 27 Problem Heavy water is : a. Water containing Fe, Cr, Mn b. Water at 00C c. D20 d. Water obtained after distillation 30. 28 Problem Volume of water needed to mix with 10 mL 10 N HNO3 to get 0.1 N HNO3 is : a. 1000 mL b. 990 mL c. 1010 mL d. 10 mL 31. 29 Problem Which will show maximum depression in freezing point when concentration is 0.1 M? a. NaCl b. Urea c. Glucose d. K2SO4 32. 30 Problem Which gives lactic acid on hydrolysis after reacting with HCN ? a. HCHO b. CH3CHO c. C6H5CHO d. CH3COCH3 33. 31 Problem CHCl3 and KOH on heating with a compound form a bad smelling product, compound is : a. C2H5CN b. C2H5NC c. C2H5OH d. C2H5NH2 34. 32 Problem On exciting Cl2 molecules by UV light, we get : a. Cl b. Cl+ c. Cl- d. All of these 35. 33 Problem Correct statement about 1, 3-dibutene : a. Conjugated double bonds are present b. Reacts with HBr c. Forms polymer d. All of the above 36. 34 Problem Isomerism due to rotation round single bond of carbon-carbon is : a. Enantiomerism b. Position isomerism c. Conformation d. Diastereo isomerism 37. 35 Problem Which pair does not show hydrogen isotopes ? a. Ortho and para hydrogen b. Protium and deuterium c. Deuterium and tritium d. Tritium and protium 38. 36 Problem Which pair cannot exist together in solution ? a. NaHCO3 and NaOH b. NaHCO3 and NaCl c. NaHCO3 and Na2CO3 d. NaCl and Na2CO3 39. 37 Problem When an electron is removed from an atom, its energy ; a. Increases b. Decreases c. Remains the same d. None of the above 40. 38 Problem In a reaction, when the concentration of reactant is increased two times, the increase in rate of reaction was four times. Order of reaction is : a. Zero b. 1 c. 2 d. 3 41. 39 Problem Strongest base is : a. C6H5NH2- b. p-NO2 C6H4NH2 c. m-NO2 C6H4NH2 d. C6H5CH2NH2 42. 40 Problem The value of one amu is : 1.66 x 10-24 g 6.023 x 1023 g 1.4 x 10-21 g 4.8 x 10-24 g 43. 41 Problem Which of the following has minimum melting point ? a. CsF b. HCl c. HF d. LiF 44. 42 Problem Which of the following is related with both wave nature and particle nature ? a. Interference b. E = mc2 c. Diffraction d. E = hv 45. 43 Problem Nirogen is obtained when NaNO2 react with : a. NH4Cl b. NH4NO3 c. (NH4)2CO3 d. NH4OH 46. 44 Problem Hydrogen bond energy is equal to : a. 3-7cal b. 30-30cal c. 3-10 kcal d. 30-70 kcal 47. 45 Problem Strongest hydrogen bond is present in : a. F H ..O b. S H . O c. O H . S d. F H .. F 48. 46 Problem Which of the following has dipole moment ? a. CO2 b. p-dichlorobenzene c. NH3 d. CH4 49. 47 Problem Which of the following pKa values, represent the strongest acid ? a. 10-4 b. 10-8 c. 10-5 d. 10-2 50. 48 Problem Which group of the periodic table contains coinage metal ? a. IIA b. IB c. IA d. None of these 51. 49 Problem Which of the following has maximum bond energy ? a. Cl2 b. F2 c. Br2 d. I2 52. 50 Problem For a process to spontaneous, the most favourable conditions is : a. H > 0, S > 0 b. H < 0, S > 0 c. H < 0, S < 0 d. H > 0, S < 0 53. FOR SOLUTIONS VISIT WWW.VASISTA.NET