This document contains a 50 question chemistry practice test with multiple choice answers for each question. The test covers topics such as organic chemistry, inorganic chemistry, physical chemistry, and more. Each question provides 4 possible answer choices with only one being correct.

1. aipmt–Past papersCHEMISTRY - UNSOLVED PAPER - 2007

2. SECTION – I (Total Marks :50)Single Correct Answer TypeThere are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate.

3. 01ProblemWhich one of the following on reduction with lithium aluminum hydride yields a secondary amine ?Methyl isocyanideAcetamideMethyl cyanideNitroethane.

4. Problem02RNA & DNA are chiral molecule, there chirality is due toChiral baseChiral phosphate ester unitsD-sugar componentsL-sugar components

5. Problem03The Langmuir adsorption isotherm is deduced using the assumptionThe absorption sites are equivalent in there ability to absorb the particleThe heat of absorption varies with coverageThe absorption molecules interact with each otherThe absorption take place in multilayers.

6. Problem04A weak acid, HA, has a Ka,, of 1.00 X 10-5. If 0.100 mol of this acid is dissolved in one liter of water, the percentage of acid dissociated at equilibrium is closed to1.00%99.9%0.100%99.0%

7. Problem05The reaction of hydrogen & iodine monochloride is given as:H2 (g) + 2ICl(g)->2HCl(g) + I2 (g)These reaction is of first order with respect to H2(g) & HCl(g) , following mechanism were proposed.Mechanism A:H2 (g) + 2ICl(g)->2HCl(g) + I2 (g)Mechanism B:H2 (g) + ICl(g)->HCl(g) + HI2 (g); slowHI(g) + ICl(g) ->HCl(g) + I2 (g) ; fastWhich of the above mechanism(s) can be consistent with the given information about the reaction?A & B bothNeither A nor B A onlyB only

8. Problem06The efficiency of a fuel cell is given byΔG/ΔSΔG/ΔHΔS/ΔGΔH/ΔG

9. Problem07Consider the following reactions:(i) H+(aq) +OH-(aq)=H2O(l) ; ΔH=-X1 kJ mol-1(ii) H2 (g) +1/2O2 (g) =H2O(l) ; ΔH=-X2 kJ mol-1(iii) CO2 (g) + H2 (g) =CO(g)+ H2O ; ΔH=-X3 kJ mol-1(iv) C2 H2 (g) +5/2O2 (g) =2CO2 (g) + H2O(l) ; ΔH=+X4 kJ mol-1Enthalpy formation of H2O(l) is+X3 kJ mol-1- X4 kJ mol-1+ X1 kJ mol-1- X2 kJ mol-1

10. Problem08The correct order of increasing thermal stability of K2CO3 , MgCO3 , CaCO3 & BeCO3 isBeCO3 < MgCO3< CaCO3< K2CO3MgCO3< BeCO3 < CaCO3< K2CO3K2CO3< MgCO3< CaCO3< BeCO3BeCO3< MgCO3< K2CO3< CaCO3

11. Problem09In which of the following pairs, the two species are iso-structural ?SO32- & NO3-BF3 & NF3BrO3- & XeO3SF4 & XeF4

12. Problem10Which of the following oxidation states are the most characteristic for lead & tin respectively?+2, +4+4, +4+2 ,+2+4, +2

13. Problem11Which of the following statement, about the advantage of roasting of sulphide ore before reduction is not true ?The ΔG0f of the sulphide is greater than those for CS2 & H2S.The ΔG0f is negative for roasting of sulphide ore to oxidesRoasting of sulphides to the oxide is thermodynamically feasible.Carbon & hydrogen are suitable reducing agents for metal sulphides

14. Problem12In a first order reaction A->B , if k is rate constant & initial concentration of the reactant A is 0.5 M , then the half life isa.b.c.d.

15. Problem13The correct decreasing order of their reactivity towards hydrolysis is(i) C6H5COCI(ii)(iii)(iv)(i) > (ii) >(iii)> (iv) (iv) >(ii) >(i) > (iii)(ii) > (iv) > (i) > (iii)(ii) > (iv) >(iii) >(i)

16. Problem14Predict the product C obtained in the following reaction of butyne-1.CH3CH2-C≡CH + HCla.b.c.d.

17. Problem15Concentrated aqueous sulphuric acid is 98% H2SO4 by mass & has a density of 1.80 g mL-1. Volume of acid require to make one liter of 0.1M H2SO4 solution is16.65 mL22.20 mL5.55 mL11.10 mL

18. Problem16Reduction of aldehydes & ketones into hydrocarbons using zinc amalgam & con.HCl is calledCope reductionDow reductionWolf-Kishner reductionClemmensen reduction

19. Problem17Given the bong energies of H-H & Cl-Cl are 430 kJmol-1 & 240 kJ mol-1 respectively & ΔHf for HCl is -90 kJmol-1, bond enthalpy of HCl is380 kJ mol-1425 kJ mol-1245 kJ mol-1290 kJ mol-1

20. Problem18Which of the following represent the correct order of the acidity in the given compounds ?FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOHBrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOHFCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOHCH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH

21. Problem19If there is no rotation of the plane polarized light by a compound in a specific solvent, through to be chiral, it may mean thatThe compound is certainly mesoThere is no compound in the solventThe compound may be a racemic mixtureThe compound is certainly a chiral.

22. Problem20CH3-CHCl-CH2-CH3 has a chiral center. Which one of the following represented its R- configuration ?a.b.c.d.

23. Problem21Which of the following vitamin is water soluble ?vitamin Evitamin Kvitamin Avitamin B

24. Problem22Identify the correct order of the size of the following :Ca2+ < K+ < Ar < Cl- < S2-Ar < Ca2+ < K+ < Cl- < S2-Ca2+ < Ar < K+ < Cl- < S2-Ca2+ < K+ < Ar < S2-< Cl-

25. Problem230.5molar aqueous solution of a week acid (HX) is 20% ionized. If Kf for water is1.86 K kgmol-1 , the lowering in freezing point of the solution is0.56 K1.12 K-0.56 K-1.12 K

26. Problem24Sulphide ores of metal are usally concentrated by froth flotation process. Which one of the following sulphide ores offer an exception & is concentrated by chemical leaching ?GalenaCopper pyriteSphaleriteArgentite.

27. Problem25If 60% of a first order reaction was completed in 60 minutes , 50% of the same reaction would be completed in approximately45 minutes60 minutes40 minutes50 minutes(log4=0.60, log 5=0.69)

28. Problem26Which of the following will give a pair of enantiomorphs ?[Cr(NH3)6][Co(CN)6][Co(en)2Cl2]Cl[Pt(NH3)4][PtCl6][Co(NH3)4Cl2]NO2(en=NH2CH2CH2NH2)

29. Problem27If NaCl is doped with 10-16 mol% of SrCl2, the concentration of cation vacancies will be (NA=6.02 X 1023 mol-1)6.02 X 1016 mol-16.02 X 1017 mol-16.02 X 1014 mol-16.02 X 1015 mol-1

30. Problem28The d electron configurations of Cr2+, Mn2+, Fe2+ & Ni2+ are 3d4, 3d5, 3d6, & 3d8respectively. which one of the following aqua complex will exhibit the minimum paramagnetic behavior ?[Fe(H2O)6]2+[Ni(H2O)6]2+[Cr(H2O)6]2+[Mn(H2O)6]2+(At.No. Cr=24, Mn=25, Fe=26, Ni=28)

31. Problem29In which of the following the hydration energy is higher than the lattice energy ? MgSo4RaSO4SrSO4BaSO4

32. Problem30Which of the compounds with molecular formula C5H10 yields acetone to ozonolysis ?3-methyl-1-buteneCyclopentane2-methyl-1-butene2-methyl-2-butene

33. Problem31With which of the following electronic configuration an atom has the lowest ionization enthalpy?1s2 2s2 2p21s2 2s2 2p5 3s11s2 2s2 2p61s2 2s2 2p5

34. Problem32With which of the following ionic species has the greatest proton affinity to form stable compound ?HH2-F-I-HS-

35. Problem33 The following equilibrium constants are given :The equilibrium constant for the oxidation of NH3 by oxygen to give NO is K2K32/K1K22K3/K1K1K2/K3K2K33/K1

36. Problem34Which one of the following ions is the most stable in aqueous solution ?V3+Ti3+Mn3+Cr3+( at. No. Ti=22 , V= 23, Cr=24, Mn=25)

37. Problem35The correct order of C-O bond length among CO, CO32- , CO2 isCO < CO32- < CO2CO32- < CO2< COCO < CO2 < CO32-CO2< CO32- < CO

38. Problem36Which one of the following orders correctly represents the increasing acidic strength of the given acids ?HOClO < HOCl < HOClO3 < HOClO2HOClO2 < HOClO3 < HOClO < HOClHOClO3 < HOClO2 < HOClO < HOClHOCl < HOClO < HOClO2 < HOClO3.

39. Problem37Which one of the following on treatment with 50% aqueous solution hydroxide yields the corresponding alcohol & acid ?C6H5CHOCH3CH2CH2CHOC6H5 CH2CHO

40. Problem38For I-, Cl-, Br- , the increasing order of nucleophilicity would beCl- < Br- < I-I- < Cl- < Br-Br- < Cl- < I-I- < Br- < Cl-

41. Problem39Calculate the pOH of a solution at 25°C that contain 1X10-10 M of hydronium ions, i.e. H3O+4.0009.0001.0007.000

42. Problem40Consider the following sets of quantum numbers:Which of the following sets of quantum number is not possible?(i), (ii), (iii) & (iv)(ii), (iv) & (v)(i) & (ii)(ii), (iii) & (iv)

43. Problem41The equilibrium constant of the reaction:Cu(s) + 2Ag+(aq)-> Cu2+ (aq) + 2Ag (s)E0 =0.46V at 298K is2.0 X 10104.0 X 10104.0 X 10152.4 X 1010

44. Problem42Which one of the following polymers prepared by condensation polymerization ?TeflonNatural rubberStyreneNylon-66

45. Problem43The order of decreasing reactivity towards an electrophilic reagent, for the following would beBenzeneTolueneChlorobenzenePhenol(ii) > (iv) > (i) >(iii)(iv) > (iii)> (ii) >(i)(iv) >(ii) >(i)> (iii)(i) >(ii) >(iii)> (iv)

46. Problem44Which one of the following anions is present in the structure of silicates ?(Si2O52-)n(SiO32-)nSiO44-Si2O76-

47. Problem45An element , X has the following isotopic composition200X:90 %199X:8.0 %202X:2.0 %The weighted average atomic mass of the naturally occurring element X is closed to 201 amu202 amu199 amu200 amu

48. Problem46The fraction of total volume occupied by the atoms present in a simple cube is a. b.c.d.

49. Problem47In the reactionWhich of the following compounds will be formed?a.b. c.d.

50. Problem48The product formed in Aldol condensation isA β- hydroxyaldehyde or a β- hydroxyketoneAn α- hydroxyaldehyde or ketoneAn α, β-unsaturated esterA β- hydroxyl acid.

51. Problem49The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is4/52/513/5

52. Problem50Identify the incorrect statement among the following :Lanthanoid contraction is the accumulation of successive shrinkages.As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.Shielding power of 4f electrons is quite weak.There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.

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