This document contains a 35 question chemistry exam with multiple choice answers. It covers topics like organic reactions, equilibrium, acid-base chemistry, and nomenclature. The questions test understanding of concepts like stereochemistry, reaction mechanisms, thermodynamics, acid strength, and IUPAC nomenclature rules. This appears to be a past exam that could be used to study for a general chemistry or organic chemistry course.

1. AEEE –Past papersCHEMISTRY - UNSOLVED PAPER - 2008

2. SECTION – IStraight Objective TypeThis section contains multiple choice questions numbered 35 . Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.

3. 01ProblemThe organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction, is(C2H5)2CHCl (CH3)3CCl(CH3)2CHCl CH3Cl

4. Problem02Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed containsmixture of o− and p−bromotoluenesmixture of o− and p−dibromobenzenes mixture of o− and p−bromoanilinesmixture of o− and m−bromotoluenes

5. Problem03The coordination number and the oxidation state of the element ‘E’ in the complex [E(en)2(C2O4)]NO2 (where (en) is ethylene diamine) are, respectively,6 and 2 4 and 24 and 3 6 and 3

6. Problem04Identify the wrong statements in the following:Chlorofluorocarbons are responsible for ozone layer depletion Greenhouse effect is responsible for global warmingOzone layer does not permit infrared radiation from the sun to reach the earthAcid rains is mostly because of oxides of nitrogen and sulphur

7. Problem05Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives2,4,6-trinitrobenzene o-nitrophenol p-nitrophenol nitrobenzene

8. Problem06In the following sequence of reactions, the alkene affords the compound ‘B’O3 H2O 3 Zn CH 3 CH = CH 3 CH The compound B isCH3CH2CHO CH3COCH3CH3CH2COCH3CH3CHO

9. Problem07Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being4f orbitals more diffused than the 5f orbitalslesser energy difference between 5f and 6d than between 4f and 5d orbitalsmore energy difference between 5f and 6d than between 4f and 5d orbitalsmore reactive nature of the actinoids than the lanthanoids

10. Problem08In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of Δ o be the highest?[Co(CN)6]3− [Co(C2O4)3]3− [Co(H2O)6]3+ [Co(NH3)6]3+

11. Problem09At 80oC, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80oC and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)52 mol percent 34 mol percent48 mol percent 50 mol percent

12. Problem10For a reaction ½ A 2B,-> rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expressiona.b.c.d.

13. Problem11The equilibrium constants P1 K and P2 K for the reactions X 2Y and Z P +Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is1 : 36 1 : 11 : 3 1 : 9

14. Problem12Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below:The energy involved in the conversion of (using the data, will bea. +152 kJmol−1b. −610 kJmol−1c. −850 kJmol−1d. +120 kJmol−1

15. Problem13Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?Metal sulphides are thermodynamically more stable than CS2CO2 is thermodynamically more stable than CS2Metal sulphides are less stable than the corresponding oxidesCO2 is more volatile than CS2

16. Problem14Bakelite is obtained from phenol by reacting with(CH2OH)2CH3CHOCH3COCH3 HCHO

17. Problem15For the following three reactions a, b and c, equilibrium constants are given:a. CO (g ) +H 2O (g) CO 2(g) +H2 (g) ; K1b. CH4 (g) +H2O (g) CO2 (g) + 3H 2(g) ; K2c. CH4 (g) + 2H2 O (g) CO2 (g) + 4H2 (g) ; K4Which of the following relations is correct?K1 √2 = K3 K2 K3 = K1 K3 = K1K2K3K32=k21

18. Problem16The absolute configuration of isS, S R, RR, S S, R

19. Problem17The electrophile, E⊕ attacks the benzene ring to generate the intermediate σ-complex. Of the following, which σ-complex is of lowest energy?a.b.c.d.

20. Problem18α-D-(+)-glucose and β-D-(+)-glucose areConformersepimersanomersenantiomers

21. Problem19Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK−1mol−1, respectively. For the reaction, ½ X2 + 3/2 Y3-> X Y3,∆ H = - to be at equilibrium, the perature will be 1250 K 500 K750 K 1000 K

22. Problem20Four species are listed belowHCO−3 H3O+iii. HSO−4 iv. HSO3FWhich one of the following is the correct sequence of their acid strength?iv < ii < iii < I ii < iii < i < ivi < iii < ii < iv iii < i < iv < ii

23. Problem21Which one of the following constitutes a group of the isoelectronic species?C 22 − , O2 − , CO, NONO+ , C22 − , CN− , N 2CN− , N2 , O22 − , C 22 − N 2 , O 2− , NO+ , CO

24. Problem22Which one of the following pairs of species have the same bond order?CN− and NO+CN− and CN+ 2 O− and CN− NO+ and CN+

25. Problem23The ionization enthalpy of hydrogen atom is 1.312 × 106 Jmol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is8.51 × 105 Jmol−16.56 × 105 Jmol−17.56 × 105 Jmol−1 9.84 × 105 Jmol−1

26. Problem24Which one of the following is the correct statement?Boric acid is a protonic acidBeryllium exhibits coordination number of sixChlorides of both beryllium and aluminium have bridged chloride structures in solid phase B2H6.2NH3 is known as ‘inorganic benzene’

27. Problem25Given The potential for the Fe is0.26 V 0.399 V −0.339 V −0.26 V

28. Problem26Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HClgets oxidised by oxalic acid to chlorinefurnishes H+ ions in addition to those from oxalic acidreduces permanganate to Mn2+oxidises oxalic acid to carbon dioxide and water

29. Problem27The vapour pressure of water at 20oC is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20oC, the vapour pressure of the resulting solution will be17.675 mm Hg 15.750 mm Hg16.500 mm Hg 17.325 mm Hg

30. Problem28Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis isR4Si RSiCl3R2SiCl2R3SiCl

31. Problem29In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?CO and H2 are fractionally separated using differences in their densitiesCO is removed by absorption in aqueous Cu2Cl2 solutionH2 is removed through occlusion with PdCO is oxidised to CO2 with steam in the presence of a catalyst followed by absorption of CO2 in alkali

32. Problem30In a compound atoms of element Y from ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will beX4Y3 X2Y3 X2Y X3 Y4

33. Problem31Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers isD < A < C < B C < B < D < AA < C < B < D B < D < A < C

34. Problem32The hydrocarbon which can react with sodium in liquid ammonia isCH3CH2CH2C≡CCH2CH2CH3 CH3CH2C≡CHCH3CH=CHCH3CH3CH2C≡CCH2C

35. Problem33The treatment of CH3MgX with CH3C≡C−H producesCH3−CH=CH2 CH3C≡C−CH3c. CH4

36. Problem34The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is−COOH, −SO3H, −CONH2, −CHO −SO3H, −COOH, −CONH2, −CHO−CHO, −COOH, −SO3H, −CONH2−CONH2, −CHO, −SO3H, −COOH

37. Problem35The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be9.58 4.797.01 9.22

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