, 112, SHAKTI NAGAR, KOTA (RAJ.) PH. 0744 -2500492, 2500092 FAX 0744 -2500892 AIEEE Questions Page # 1 1. The energies of activation for forward and reverse reactions for A2 + B2 2AB are 180 kJ mol–1 and 200 kJ mol–1 respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol–1. The enthalpy change of the reaction (A2 + B2 → 2AB) in the presence of catalyst will be (in kJ mol–1) – (1) 300 (2) 120 (3) 280 (4) 20 Ans. [4] 2. The cell, Zn | Zn2 (1M) || Cu2+ (1M) | Cu (Eºcell) = 1.10 V), was allowed to be completely discharged at 298 K. The relative concentration of Zn2+ to Cu2+ [Zn ] [Cu ] 22++ is – (1) Antilog (24.08) (2) 37.3 (3) 1037.3 (4) 9.65 × 104 Ans. [3] 3. The 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 is (1) 4.5 (2) 2.5 (3) 9.5 (4) 7.0 Ans. [3] 4. Consider the reaction, 2A + B → Products. When concentration of B alone was doubled, the halfliif 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 is – (1) L mol–1 s–1 (2) no unit (3) mol L–1s–1 (4) s–1 Ans. [1] 5. Identify the incorrect statement among the following – (1) d-Block elements show irregular and erratic chemical properties among themselves (2) La and Lu have partially filled d orbitals and no other partially filled orbitals (3) The chemistry of various lanthanoids is very similar (4) 4f and 5f orbitals are equally shielded Ans. [4] 6. Which one of the following has a square planar geometry? (1) [CoCl4]2– (2) [FeCl4]2– (3) [NiCl4]2– (4) [PtCl4]2– (At. Nos. Co = 27, Ni = 28, Fe = 26, Pt = 78) Ans. [4] 7. Which of the following molecules is expected to rotate the plane of plane-polarised light? (1) (2) (3) (4) Ans. [1] CHEMISTRY AIEEE-2007 FINAL EXAMINATION PAPER, 112, SHAKTI NAGAR, KOTA (RAJ.) PH. 0744 -2500492, 2500092 FAX 0744 -2500892 AIEEE Questions Page # 2 8. The secondary structure of a protein refers to – (1) α-helical backbone (2) hydrophobic interactions (3) sequence of α-amino acids (4) fixed configuration of the polypeptide backbone Ans. [1] 9. Which of the following reactions will yield 2, 2-dibromopropane? (1) CH3 – C ≡ CH + 2HBr → (2) CH3CH = CHBr + HBr → (3) CH ≡ CH + 2HBr → (4) CH3 – CH = CH2 + HBr → Ans. [1] 10. In the chemical reaction, CH3CH2NH2 + CHCl3 + 3KOH → (A) + (B) + 3H2O, the compounds (A) and (B) are respectively – (1) C2H5CN and 3KCl (2) CH3CH2CONH2 and 3KCl (3) C2H5NC and K2CO3 (4) C2H5NC and 3KCl Ans. [4] 11. The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly – (1) benzoyl chloride (2) benzyl chloride (3) o-and p-chlorotoluene (4) m-chlorotoluene Ans. [3] 12. Presence of a nitro group in a benzene ring – (1) activates the ring towards electrophilic substitution (2) renders the ring basic (3) deactivates the ring towards nucleophilic substitution (4) deactivates the ring towards electrophilic substitution Ans. [4] 13. In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed ? (1) C2 → C2+ (2) NO → NO+ (3) O2 → O2+ (4) N2 → N2+ Ans. [2] 14. The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because – (1) the 5f orbitals are more buried than the 4f orbitals (2) there is a similarity between 4f and 5f orbitals in their angular part of the wave function (3) the actinoids are more reactive than the lanthanoids (4) the 5f orbitals extend further from the nucleus than the 4f orbitals Ans. [4] 15. Equal masses of methane and oxygen are mixed in an empty container at 25ºC. The fraction of the total pressure exerted by oxygen is – (1) 32 (2) 298 273 31 × (3) 31 (4) 21 Ans. [3], 112, SHAKTI NAGAR, KOTA (RAJ.) PH. 0744 -2500492, 2500092 FAX 0744 -2500892 AIEEE Questions Page # 3 16. A 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 gcm–3, molar mass of the substance will be – (1) 90.0g mol–1 (2) 115.0g mol–1 (3) 105.0g mol–1 (4) 210.0 g mol–1 Ans. [4] 17. Assuming that water vapour is an ideal gas, the internal energy change(∆U) when 1 mol of water is vapourised at 1 bar pressure and 100°C, (Given : Molar enthalpy of vapourisation of water at 1 bar and 373 K = 41 kJ mol-1 and R = 8.3 J mol–1K–1 will be) – (1) 4.100 kJ mol–1 (2) 3.7904 kJ mol–1 (3) 37.904 kJ mol–1 (4) 41.00 kJ mol–1 Ans. [3] 18. In a saturated solution of the sparingly soluble strong electrolyte AgIO3 (molecular mass = 283) the equilibrium which sets in is – AgIO3(s) Ag+(aq) + IO3¯ (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 ? (1) 28.3 × 10–2 g (2) 2.83 × 10–3 g (3) 1.0 × 10–7 g (4) 1.0 × 10–4 g Ans. [2] 19. A 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 ? (1) 1000 days (2) 300 days (3) 10 days (4) 100 days Ans. [4] 20. Which one of the following conformations of cyclohexane is chiral ? (1) Twist boat (2) Rigid (3) Chair (4) Boat Ans. [1] 21. Which of the following is the correct order of decreasing SN2 reactivity ? (1) RCH2X > R3CX > R2CHX (2) RCH2X > R2CHX > R3CX (3) R3CX > R2CHX >RCH2X (4) R2CHX > R3CX >RCH2X (X = a halogen) Ans. [2] 22. In the following sequence of reactions, CH3CH2OH → + 2 I P A Mg ether → B → HCHO C → O H2 D, then compound ‘D’ is – (1) butanal (2) n-butyl alcohol (3) n-propyl alcohol (4) propanal Ans. [3], 112, SHAKTI NAGAR, KOTA (RAJ.) PH. 0744 -2500492, 2500092 FAX 0744 -2500892 AIEEE Questions Page # 4 23. Which of the following sets of quantum numbers represents the highest energy of an atom ? (1) n = 3, l = 1, m = 1, s = +½ (2) n = 3, l = 2, m = 1, s = +½ (3) n = 4, l = 0, m = 0, s = +½ (4) n = 3, l = 0, m = 0, s = +½ Ans. [2] 24. Which of the following hydrogen bonds is the strongest ? (1) O – H …… N (2) F – H …… F (3) O – H ….. O (4) O – H …… F Ans. [2] 25. In the reaction, 2Al(s) + 6HCl(aq) → 2Al3+(aq) + 6Cl¯(aq) + 3H2(g), (1) 6L HCl(aq) is consumed for every 3L H2(g) produced (2) 33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts (3) 67.2 L H2(g) at STP is produced for every mole Al that reacts (4) 11.2 L H2(g) at STP is produced for every mole HCl(aq) consumed Ans. [4] 26. Regular use of which of the following fertilizers increases the acidity of soil ? (1) Potassium nitrate (2) Urea (3) Superphosphate of lime (4) Ammonium sulphate Ans. [4] 27. Identify the correct statement regarding a sponateous process – (1) For a spontaneous process in an isolated system, the change in entropy is positive (2) Endothermic processes are never spontaneous (3) Exothermic processes are always spontaneous (4) Lowering of energy in the reaction process is the only criterion for spontaneity Ans. [1] 28. Which of the following nuclear reactions will generate an isotope ? (1) neutron particle emission (2) positron emission (3) α-particle emission (4) β-particle emission Ans. [1] 29. The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25ºC are given below : Λ°CH COONa 3 = 91.0 S cm2/equiv ΛºHCl = 426.2 S cm2/equiv What additional information/quantity one needs to calculate Λº of an aqueous solution of acetic acid ? (1) Λº of NaCl (2) Λº of CH3COOH (3) The limiting equivalent conductance of H+(λ° + H ) (4) Λº of chloroacetic acid (ClCH2COOH) Ans. [1], 112, SHAKTI NAGAR, KOTA (RAJ.) PH. 0744 -2500492, 2500092 FAX 0744 -2500892 AIEEE Questions Page # 5 30. Which one of the following is the strongest base in aqueous solution ? (1) Trimethylamine (2) Aniline (3) Dimethylamine (4) Methylamine Ans. [3] 31. The compound formed as a result of oxidation of ethyl benzene by KMnO4 is – (1) benzophenone (2) acetophenone (3) benzoic acid (4) benzyl alcohol Ans. [3] 32. The IUPAC name of is – (1) 1, 1-diethyl-2-dimethylpentane (2) 4, 4-dimethyl-5, 5-diethylpentane (3) 5, 5-diethyl-4, 4-dimethylpentane (4) 3-ethyl-4, 4 dimethylheptane Ans. [4] 33. Which of the following species exhibits the diamagnetic behaviour ? (1) O22– (2) O2+ (3) O2 (4) NO Ans. [1] 34. The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence – (1) GeX2 << SiX2 << SnX2<< PbX2 (2) SiX2 << GeX2 << PbX2<< SnX2 (3) SiX2 <