1. AMU PAST PAPERSCHEMISTRY- UNSOLVED PAPER - 2002

2. SECTION I 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 Which of the following carbonates is last soluble in water ? a. NaHCO3 b. CaCO3 c. MgCO3 d. Na2CO3 4. 02 Problem The bond energies of F2, Cl2 Br2 and I2 are 155, 244, 193 and 151 kJ/mol. The weakest bond will be in : a. Cl2 b. I2 c. Br2 d. F2 5. 03 Problem The number of unpaired electrons in ferrous ion is : a. 3 b. 2 c. 5 d. 4 6. 04 Problem How many optically active isomers are possible for butane 2, 3-diol ? a. 2 b. 4 c. 1 d. 3 7. 05 Problem One mole of SO2 corresponds to a. 6.4 g of SO2 b. 6.02 x 1023 molecules of SO2 c. 22.4 L at 250C and 1 atm d. all the these 8. 06 Problem Which of the following statements about vitamin B12 is false ? a. It has a cobalt atom b. It also occurs in plants c. It is present in rain water d. It is needed for human body in very small amounts 9. 07 Problem A mixture of benzoic acid and naphthalene can be separated by crystallization from : a. Cold water b. Ether c. Hot water d. Benzene 10. 08 Problem The internal energy of one mole of a gas is :3 a. 2 KT1 b. 2 KT3 c. 2 RT1 d. 2 RT 11. 09 Problem The term pH comes from : a. pure voiv hydrogene which implies potential of hydrogen b. pure hydrogen content c. purity of hydrogen ions in solution d. name of the scientist associated 12. 10 Problem The number of atoms in 0.004 g of magnesium is close to : a. 2 x 1020 b. 6.02 x 1023 c. 24 d. 1020 13. 11 Problem Propene when heated with chlorine at about 5000C forms : a. CH2Cl CH = CH2 b. CH3 CHCl CH2Cl c. CH2Cl CHCl CH2Cl d. All of these 14. 12 Problem Absolute alcohol is : a. 95% ethanol b. 75% ethanol c. 100% ethanol d. mixture of various primary alcohols 15. 13 Problem CH3CHO HCNX H2O / HY In the above sequence Y is : a. Lactic acid b. Formic acid c. Cinnamic acid d. Acetic acid 16. 14 Problem Aniline reacts with concentrated HNO3 to give : a. b. c. d. 17. 15 Problem Which one of the following is most basic ? a. Cl - b. F c. I d. Br 18. 16 Problem The volume strength of 1.5 N H2O2 solution is : a. 5.2 b. 8.4 c. 8.8 d. 4.8 19. 17 Problem the highest number of unpaired electrons are present in : a. Fe4+ b. Fe3+ c. Fe0 d. Fe2+ 20. 18 Problem The nineteenth electron chromium has which of the following set of quantum number ?n lm s 1 a. 3 00 21 b. 3 2-2 21 c. 4 0021 d. 4 1-1 2 21. 19 Problem What is the correct sequence of bond order ? a. O2+ > O2- > O2 b. O2 > O2-1 > O2+1 c. O2+ > O2 > O2- d. O2-1 > O2+1 > O2 22. 20 Problem Bond order of N O bonds in nitrate ion is : a. 1.25 b. 1.50 c. 1.33 d. 1.0 23. 21 Problem Which bond is most polar ? a. F F b. I F c. Cl F d. Br F 24. 22 Problem The effect of a catalyst in a chemical reaction is to change the : a. Equilibrium concentration b. Heat of reaction c. Activation energy d. Final product 25. 23 Problem Which of the following aqueous solutions will have highest freezing point : a. 0.1 m CaCl2 b. 0.1 m KCl c. m glucose d. m Al2(SO4)3 26. 24 Problem Which oxidation numbers are shown by carbon ? a. - 1, - 2, - 3, - 4 b. 4, + 3, + 2, + 1 c. 0 d. All of these 27. 25 Problem The spectrum of He+ is expected to be similar to that of : a. Be+2 b. Li+ c. Na d. H 28. 26 Problem Bleaching action. Of SO2 is due to : a. Oxidation b. Reduction c. Hydrolysis d. Its acidic nature 29. 27 Problem Water gas is essentially a mixture of ? a. H2O(g) and CO2 b. H2O and CO c. H2 and CO d. CO and CO2 30. 28 Problem Which is the strongest reducing agent ? a. Mg b. Rb c. Na d. K 31. 29 Problem Mortar is a mixture of slaked lime and sand in the ratio : a. 1 : 4 b. 2 : 3 c. 1 : 3 d. 3 : 1 32. 30 Problem Which of manufactured by electrolysis of fused NaCl ? a. NaClO3 b. NaClO c. NaOH d. Na 33. 31 Problem The wire in the flash bulbs is made up of : a. Ag b. Cu c. Ba d. Mg 34. 32 Problem K4[Fe(CN)6] is called : a. Prussian blue b. Potasium ferricyanide c. Potassium hexacyano ferrate (II) d. Potassium hexacyanoferrate (III) 35. 33 Problem Which of the following does not react with AgCl ? a. Na2CO3 b. Na2S2O3 c. NH4OH d. NaNO3 36. 34 Problem The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is : a. 1 b. 4/5 c. 3/5 d. 2/5 37. 35 Problem Anorganic compound X on treatment with acidified K2Cr2O7 gives compound Y. Which reacts with I2 and sodium carbonate to form triiodomethane. The compound X can be : a. CH3CH(OH)CH3 b. CH3CHO c. ** d. CH3OH 38. 36 Problem The reaction of HCOOH with conc. H2SO4 gives : a. CH3COOH b. (COOH)2 c. CO2 d. CO 39. 37 Problem Formalin is : a. 40% solution of formaldehyde in acetaldehyde b. 40% solution of formaldehyde in acetone c. 40% solution of formaldehyde in water d. liquid formaldehyde 40. 38 Problem Alcohol reacts with Grignard reagent to form : a. Alkanes b. Alkenes c. Alkynes d. All of these 41. 39 ProblemAcetone RCl + NaI R I + NaCl This reaction is known as : a. Wurtz reaction b. Fitting reaction c. Frankland reaction d. Finkelstein reaction 42. 40 Problem The weight in g of 1 curie of radioactive element 200X having a t1/2 of 69.3 min is : a. 3.0 x 10-8 g b. 7.4 x 10-8 g c. 3.7 x 10-8 g d. 200 g 43. 41 Problem Gold number is minimum in case of : a. Gum Arabic b. Starch c. Egg albumin d. Gelatin 44. 42 Problem The standard reduction potential of Li+/Li, Ba2+/Ba, Na+/Na and Mg2+/Mg are 3.05, - 2.73, - 2.71 and 2.37 volt respectively. Which one of the following is strongest oxidizing agent ? a. Ba2+ b. Mg2+ c. Na+ d. Li+ 45. 43 Problem Carbon is in the lowest oxidation state in : a. CO2 b. CF4 c. CCl4 d. CH4 46. 44 Problem Oxidation state of nitrogen is correctly given for : Compound Oxidation state a. Mg3N2 -3 b. NH2OH +1 c. (N2H5)2SO4+2 d. [CO(NH3)5Cl]Cl2 0 47. 45 Problem The solubility product of AgCl is 4.0 x 10-10 at 298 K The solubility of AgCl a. 5.0 x 10-9 M b. 2.0 x 10-5 M c. 2.2 x 10-4 M d. 1.0 10 -4 M 48. 46 Problem The standard free energy change ( G0 ) is related to equilibrium constant (K) as : a. G0 = - 2.303 RT log K b. G0 = RT log K c. G0 = 2.303 RT log K d. G0 = -2.303 RT In K 49. 47 Problem Fro reversible process, the value of S is given by the expression : a. q(rev) x T b. q(rev) T c. H/T d.T 50. 48 Problem The final product of this reaction is/are a. b. c. d. 51. 49 ProblemThe energy of an electron in nth orbit of hydrogen atom is : a. 13.6 eV n13.6 b.eV n213.6 c. 3 eV n13.6 d.eV n4 52. 50 Problem Which out of the following is called Blue John ? a. CaF2 b. CaO c. CaH2 d. Ca3P2 53. FOR SOLUTIONS VISIT WWW.VASISTA.NET