The document is a past paper for the AIEEE chemistry exam from 2007 containing 40 multiple choice questions related to chemistry concepts and calculations. The questions cover topics like thermodynamics, electrochemistry, acid-base chemistry, organic chemistry reactions, and properties of elements.

1. AIEEE –Past papersCHEMISTRY- UNSOLVED PAPER - 2007

2. SECTION – ISingle Correct Answer TypeThis Section contains 40multiple choice questions. Each question has four choices A), B), C) and D) out of which ONLY ONE is correct.

3. 01ProblemThe energies of activation for forward and reverse reactions for A2 + B 2 2AB are 180 kJ mol−1 and 200 kJ mol −1 respectively. The presence of catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol −1. The enthalpy change of the reaction (A2 + B 2 -> 2AB ) in the presence of catalyst will be (in kJ mol −1)300 120280 20

4. Problem02The cell Zn|Zn2+ (1M) ||Cu 2+1M |(CuE0cell 1.10V ), was allowed to be completely discharged at 298 K. The relative concentration of Zn2+to Cu2+ isantilog (24.08) 37.31037.39.65 ×104

5. Problem03The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is4.5 2.59.57.0

6. Problem04Consider the reaction,2A +B ->Pr oductsWhen concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction isL mol-1 s-1no unitmol L-1 s-1s-1

7. Problem05Identify the incorrect statement among the followingd-Block elements show irregular and erratic chemical properties among themselvesLa and Lu have partially filled d orbitals and no other partially filled orbitalsThe chemistry of various lanthanoids is very similar4f and 5f orbitals are equally shielded

8. Problem06Which one of the following has a square planar geometry?[CoCl 4 ]2- [FeCl 4 ] 2-[NiCl 4 ] 2-[PtCl4 ] 2-

9. Problem07Which of the following molecules is expected to rotate the plane of plane polarized light?a.b.c.d.

10. 08ProblemThe secondary structure of a protein refers toα-helical backbonehydrophobic interactionssequence of α-amino acids fixed configuration of the polypeptide backbone

11. Problem09Which of the following reactions will yield 2, 2-dibromopropane?CH 3 − C ≡ CH+ 2HBr-> CH 3 CH ≡ CHBr +HBr->CH ≡ CH+ 2HBr-> CH 3 − CH = CH2 +HBr ->

12. Problem10In the chemical reaction, CH3 CH2 NH2 − CHCl3 + 3KOH-> A + B + 3H2O, the compound (A) and (B) are respectivelyC2H5CN and 3KClCH3CH2CONH2 and 3KClC2H5NC and K2CO3 C2H5NC and 3KCl

13. Problem11The reaction of toluene with Cl2 in presence of FeCl3 gives predominantlybenzoyl chloride benzyl chlorideo-and p-chlorotoluenem-chlorotoluene

14. 12ProblemPresence of a nitro group in a benzene ringactivates the ring towards electrophilic substitutionrenders the ring basicdeactivates the ring towards nucleophilic substitutiondeactivates the ring towards electrophilic substitution

15. Problem13In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?C2 ->CNO->NOO2 ->ON2->N

16. Problem14The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is becausethe 5f orbitals are more buried than the 4f orbitalsthere is a similarity between 4f and 5f orbitals in their angular part of the wave functionthe actinoids are more reactive than the lanthanoidsthe 5f orbitals extend further from the nucleus than the 4f orbitals

17. Problem15Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen isa.b.c.d.

18. Problem16A 5.25 % solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol −1 ) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm−3, molar mass of the substance will be90.0 g mol−1 115.0 g mol −1 105.0 g mol −1 210.0 g mol −1

19. 17ProblemAssuming that water vapour is an ideal gas, the internal energy (ΔU) when 1 mol of water is vapourised at 1 bar pressure and 100°C, (Given: Molar enthalpy of vapourization of water at 1 bar and 373 K = 41 kJ mol −1 and R = 8.3 J mol −1 K −1) will be4.100 kJ mol−13.7904 kJ mol −137.904 kJ mol −141. 00 kJ mol −1

20. Problem18In a sautrated solution of the sparingly soluble strong electrolyte AgIO3 (Molecular mass = 283) the equilibrium which sets in is AgIO3(6) Ag+(aq) + IO− 3(aq) If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0 × 10−8, what is the mass of AgIO3 contained in 100 ml of its saturated solution?28.3 × 10−2 g 2.83 × 10−3 g1.0 × 10−7 g 1.0 × 10−4 g

21. Problem19A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room?1000 days300 days10 days 100 days

22. Problem20Which one of the following conformation of cyclohexane is chiral?Twist boatRigidChairBoat

23. Problem21Which of the following is the correct order of decreasing SN 2 reactivity?RCH 2 X > R3CX > R 2 CHXRCH 2 X > R 2 CHX > R 3 CXR 3 CX > R 2 CHX > RCH 2 X R 2 CHX > R 3 CX > RCH 2 X

24. Problem22In the following sequence of reactions,the compound ‘D’ isbutanal n-butyl alcoholn-propyl alcohol propanal

25. Problem23Which of the following sets of quantum numbers represents the highest energy of an atom?n = 3, l = 2,m = 1,s = +1/ 2n = 3, l = 2,m = 1,s = +1/ 2n = 4, l = 0,m = 0,s = +1/ 2 n = 3, l = 0,m = 0,s = +1/ 2

26. Problem24Which of the following hydrogen bonds is the strongest?O−H…….N F−H…….FO−H…….O O−H…….F

27. Problem25In the reaction 6 L HCl(aq) is consumed for every 3L H2(g) produced33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts67.2 L H2(g) at STP is produced for every mole Al that reacts11.2 H2(g) at STP is produced for every mole HCl(aq) consumed

28. Problem26Regular use of which of the following fertilizer increases the acidity of soil?Potassium nitrate UreaSuperphosphate of lime Ammonium sulphate

29. Problem27Identify the correct statement regarding a spontaneous processFor a spontaneous process in an isolated system, the change in entropy is positiveEndothermic processes are never spontaneousExothermic processes are always spontaneousLowering of energy in the reaction process is the only criterion for spontaneity

30. Problem28Which of the following nuclear reactions will generate an isotope ? neutron particleemissionpositron emissionα-particleemissionβ-particleemission

31. Problem29The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25°C are given below:∧0 CH3COONa∧ 0 = 91.0 S cm2 / equiv2∧0 HCl= 426.2 S cm2 / equivWhat additional information/quantity one needs to calculate ∧0 of an aqueous solution of acetic acid?∧0 of NaCl∧0 of CH3COOK∧0 The limiting equivalent conductance of∧0 of chloroacetic acid (C/CH2COOH)

32. Problem30Which one of the following is the strongest base in aqueous solution?TrimethylamineAnilineDimethylamineMethylamine

33. Problem31The compound formed as a result of oxidation of ethyl benzene by KMnO4 isbenzophenoneacetophenonebenzoic acid benzyl alcohol

34. Problem32The IUPAC name of is1, 1-diethyl-2,2-dimethylpentane 4, 4-dimethyl-5, 5-diethylpentane5, 5-diethyl-4, 4-diemthylpentane 3-ethyl-4, 4-dimethylheptane

35. Problem33Which of the following species exhibits the diamagnetic behaviour?O OO 2NO

36. Problem34The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequenceGeX 2 « SiX 2 « SnX 2 « PbX 2SiX2 « GeX 2 « PbX2 « SnX 2SiX 2 « GeX 2 « SnX2 « PbX 2PbX 2 « SnX 2 « GeX 2 « SiX 2

37. Problem35Identify the incorrect statement among the followingOzone reacts with SO2 to give SO3Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2OCl2 reacts with excess of NH3 to give N2 and HClBr2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O

38. Problem36The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizinig order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+?Mg2+,Be2+,K+ ,Ca2+Be2+,K + ,Ca2+,Mg2+K + ,Ca2+,Mg2+,Be2+Ca2+,Mg2+,Be2+,K+

39. Problem37The density (in g mL −1) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (Molar mass = 98 g mol−1) by mass will be 1.64 1.88 1.22 1.45

40. Problem38The first and second dissociation constants of an acid H2A are 1.0 × 10−5 and 5.0 × 10−10 respectively. The overall dissociation constant of the acid will be5.0 × 10−55.0 × 10155.0 × 10−150.0 × 105

41. Problem39A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be350 300700 360

42. Problem40In conversion of lime-stone to lime,the vales of ΔH° and ΔS° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ΔH° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is1008 K 1200845 K1118 K

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