JEE MAIN (AIEEE) Past Exam Paper-2003
Chemistry
1. In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen ?
(1) 3 → 2
(2) 5 → 2
(3) 4 → 1
(4) 2 → 5
2. The de-Broglie wavelength of a tennis ball of mass 60g moving with a velocity of 10 m/s is approximately (Planck’s constant, h = 6.63 × 10−34 Js)
(1) 10−33 m
(2) 10−31 m
(3) 10−16 m
(4) 10−25 m
3. The orbital angular momentum of r an electron revolving in an orbit is given by 
This momentum for an s-electron will be given by
(1) 
(2) zero
(3) h/2π
(4) 
4. How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.00 g ? [Atomic masses Na = 23, Cl = 35.5]
(1) 2.57 × 1021
(2) 5.14 × 1021
(3) 1.28 × 1021
(4) 1.71× 1021
5. Glass is a
(1) micro-crystalline solid
(2) super-cooled liquid
(3) gel
(4) polymeric mixture
6. Which one of the following statements is correct?
(1) Manganese slats give a violet borax-bead test in the reducing flame
(2) From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl
(3) Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution
(4) On boiling a solution having K+, Ca2+ and HCO3− ions we get a precipitate of K2Ca(CO3)2
7. According to the periodic law of elements, the variation in properties of elements is related to their
(1) atomic masses
(2) nuclear masses
(3) atomic numbers
(4) nuclear neutron-proton number ratios
8. Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(1) is a non-crystalline substance
(2) is an allotropic form o diamond
(3) has molecules of variable molecular masses like polymers
(4) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
9. The IUPAC name of CH3COCH(CH3)2 is
(1) isopropylmethyl ketone
(2) 2-methyl-3-butanone
(3) 4-methylisorpropyl ketone
(4) 3-methyl-2-butanone
10. When CH2 = CH—COOH is reduced with LiAlH4, the compound obtained will be
(1) CH3—CH2—COOH
(2) CH2 = CH—CH2OH
(3) CH3—CH2—CH2OH
(4) CH3—CH2—CHO
11. According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels
(1) in a circular path
(2) in a wavy path
(3) in a straight line path
(4) with an accelerate velocity
12. Which of the following group of transition metals is called coinage metals?
(1) Cu, Ag, Au
(2) Ru, Rh, Pd
(3) Fe, Co, Ni
(4) Os, Ir, Pt
13. The general formula CnH2nO2 could be for open chain
(1) diketones
(2) carboxylic acids
(3) diols
(4) dialdehydes
14. An ether is more volatile than an alcohol having the same molecular formula. This is due to
(1) dipolar character of ethers
(2) alcohols having resonance structures
(3) inter-molecular hydrogen bonding in ethers
(4) inter-molecular hydrogen bonding in alcohols
15. Among the following four structures I to IV:
it is true that:
(1) all four are chiral compounds
(2) only I and II are chiral compounds
(3) only III is a chiral compound
(4) only II and IV are chiral compounds
16. Which one of the following process will produce hard water?
(1) Saturation of water with CaCO3
(2) Saturation of water with MgCO3
(3) Saturation of water with CaSO4
(4) Addition of Na2SO4 to water
17. Which one of the following compounds has the smallest bond angle in its molecule?
(1) SO2
(2) OH2
(3) SH2
(4) NH3
18. Which one of the following pairs of molecules will have permanent dipole moments for both members?
(1) SiF4 and NO2
(2) NO2 and CO2
(3) NO2 and O3
(4) SiF4 and CO2
19. Which one of the following groupings represents a collection of isoelectronic species?
(At. numbers Cs = 55, Br = 35)
(1) Na+, Ca2+, Mg2+
(2) N3−, F−, Na+
(3) Be, Al3+, Cl−
(4) Ca2+, Cs+, Br
20. In the anion HCOO− the two carbon-oxygen bonds are found to be of equal What is the reason for it?
(1) Electronic orbits of carbon atom are hybridized
(2) The C =O bond is weaker than C—O bond
(3) The anion HCOO− has two resonating structures
(4) The anion is obtained by removal of a proton from the acid molecule
21. The pair of species having identical shapes for molecules of both species is
(1) CF4, SF4
(2) XeF2, CO2
(3) BF3, PCl3
(4) PF5, IF5
22. The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy
(1) V
(2) Cr
(3) Mn
(4) Fe
23. Consider the reaction equilibrium,
2SO2(g) + O2(g) ⇌ 2SO3(g); ∆H° = −198 kJ
(1) any value of temperature and pressure
(2) increasing temperature as well as pressure
(3) lowering the temperature and increasing the pressure
(4) lowering of temperature as well as pressure
24. What volume of hydrogen gas, at 273K and 1 atm pressure will be consumed in obtaining 21.6g of elemental boron(atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?
(1) 89.6 L
(2) 67.2 L
(3) 44.8 L
(4) 22.4 L
25. For the reaction equilibrium,
N2O4(g) ⇌ 2NO(g)
the concentrations of N2O4 and NO2 at equilibrium are 4.8 × 10−2 and 1.2 × 10−2 mol L−1 respectively. The value of Kc for the reaction is
(1) 3.3 × 102 mol L−1
(2) 3 × 10−1 mol L−1
(3) 3 × 10−3 mol L−1
(4) 3 × 103 mol L−1
26. The solubility in water of a sparingly soluble salt AB2 is 1.0 × 10−5 mol L−1. Its solubility product number will be
(1) 4 × 10−15
(2) 4 × 10−10
(3) 1 × 10−15
(4) 1 × 10−10
27. When during electrolysis of a solution of AgNO3, 9650 C of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be
(1) 1.08 g
(2) 10.8 g
(3) 21.6 g
(4) 108 g
28. For the redox reaction,
Zn(s) + Cu2+ (0.1 M) → Zn2+ (1M) + Cu(s) taking place in cell E0cell, is 1.10 volt. Ecell for the cell will be 
(1) 2.14 V
(2) 1.80 V
(3) 1.07 V
(4) 0.82 V
29. In a 0.2molal aqueous solution of a weak acid H X, the degree of ionization is 0.3. Taking kf for water as 85, the freezing point of the solution will be nearest to
(1) −0.480℃
(2) −0.360℃
(3) −0.260℃
(4) +0.480℃
30. The rate law for the reaction between the substances A and B is given by rate = k[A]n [B]m. On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of their reaction will be as
(1) 1/2m+n
(2) (m + n)
(3) (n – m)
(4) 2(n – m)
31. 25 mL of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a titre value of 35 mL. The molarity of barium hydroxide solution was
(1) 0.07
(2) 0.14
(3) 0.28
(4) 0.35
32. The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is
(1) ∆G = RT ln Kc
(2) −∆G = RT in Kc
(3) ∆G° = RT ln Kc
(4) −∆G° = RT ln Kc
33. If a t 298K the bond energies of C—H, C—C, C = C and H—H bonds are respectively 414, 347, 615 and 435 kJ mol−1, the value of enthalpy change for the reaction
H2C = CH2(g) + H2(g) → H3C —CH3(g) at 298K will be
(1) +250 kJ
(2) −250 kJ
(3) +125 kJ
(4) −125 kJ
34. The enthalpy change for a reaction does not depend upon the
(1) physical state of reactants and products
(2) use of different reactants for the same product
(3) nature of intermediate reaction steps
(4) difference in initial or final temperatures of involved substances
35. A pressure cooker reduces cooking time for food because
(1) heat is more evenly distributed in the cooking space
(2) boiling point of water involved in cooking is increased
(3) the higher pressure inside the cooker crushes the food material
(4) cooking involves chemical changes helped by a rise in temperature
36. If liquids A and B form an ideal solution, the
(1) enthalpy of mixing is zero
(2) entropy of mixing is zero
(3) free energy of mixing is zero
(4) free energy as well as the entropy of mixing are each zero
37. For the reaction system,
2NO(g) + O2(g) → 2NO2(g)
volume is suddenly reduced to half its value by increasing the pressure on it. If the reaction is of first order with respect to O2 and second order with respect to NO; the rate of reaction will
(1) diminish to one-fourth of its initial value
(2) diminish to one-eighth of its initial value
(3) increase to eight times of its initial value
(4) increase to four times of its initial value
38. For a cell reaction involving a two-electron change, the standard emf of the cell is found to be 0.295 V at 25℃. The equilibrium constant of the reaction at 25℃ will be
(1) 1 × 10−10
(2) 29.5 × 10−2
(3) 10
(4) 1 × 1010
39. In an irreversible process taking place at constant T and p and in which only pressure-volume work is being done, the change in Gibbs free energy (dG) and change in entropy (dS), satisfy the criteria
(1) (dS)V, E <0, (dG)T, p < 0
(2) (dS)V, E >0, (dG)T, p < 0
(3) (dS)V, E = 0, (dG)T, p = 0
(4) (dS)V, E = 0, (dG)T, p > 0
40. Which one of the following characteristics is not correct for physical adsorption?
(1) Adsorption on solids is reversible
(2) Adsorption increase with increase in temperature
(3) Adsorption is spontaneous
(4) Both enthalpy and entropy of adsorption are negative
41. In the respect of the equation 
in chemical kinetics. Which one of the following statements is correct?
(1) k is equilibrium constant
(2) A is adsorption factor
(3) Ea is energy of activation
(4) R is Rydberg constant
42. Standard reduction electrode potentials of three metals A, B and C are +0.5V, −3.0 V and −1.2 V respectively. The reducing power of these metals are
(1) B > C > A
(2) A > B > C
(3) C > B > A
(4) A > C > B
43. Which one of the following substances has the highest proton affinity?
(1) H2O
(2) H2S
(3) NH3
(4) PH3
44. Which one of the following is an amphoteric oxide?
(1) ZnO
(2) Na2O
(3) SO2
(4) B2O3
45. A red solid is insoluble in water. However it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is
(1) (NH4)2Cr2O7
(2) HgI2
(3) HgO
(4) Pb3O4
46. Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that
(1) concentrated hydrochloric acid emits strongly smelling HCl gas all the time
(2) oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas
(3) strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke
(4) due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud
47. The substance used in Holmes signals of the ship is a mixture of
(1) CaC2 + Ca3P2
(2) Ca3(PO4)2 + Pb3O4
(3) H3PO4 + CaCl2
(4) NH3 + HOCl
48. The number of d-electrons retained in Fe2+ (At. no. Fe = 26) ions is
(1) 3
(2) 4
(3) 5
(4) 6
49. What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
(1) Cr3 + and Cr2O72− are formed
(2) Cr2O72− and H2O are formed
(3) CrO42− is reduced to +3 state of Cr
(4) None of the above
50. In the coordination compound, K4[Ni(CN)4], the oxidation state of nickel is
(1) −1
(2) 0
(3) +1
(4) +2
51. Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in the alkaline solutions but not in acidic solutions. What is the reason for it?
(1) In acidic solutions hydration protects copper ions
(2) In acidic solutions proton coordinate with ammonia molecules forming NH4+ ions and NH3 molecules are not available
(3) In alkaline solutions insoluble Cu(OH)2 is precipitated which is soluble in excess of any alkali
(4) Copper hydroxide is an amphoteric substance
52. One mole of the complex compound Co(NH3)5Cl3, gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO3 solution to yield two moles of AgCl(s). The structure of the complex is
(1) [Co(NH3)5Cl]Cl2
(2) [Co(NH3)3Cl2]∙2NH3
(3) [Co(NH3)4Cl2]Cl ∙ NH3
(4) [Co(NH3)4Cl]Cl2 ∙ NH3
53. The radius of La3+ (Atomic number of La = 57) is 1.06 Å . Which one of the following given values will be closest to the radius of Lu3+ (Atomic number of Lu = 71)?
(1) 1.60 Å
(2) 1.40 Å
(3) 1.06 Å
(4) 0.85 Å
54. The radionuclide 
undergoes two successive β-decays followed by one α-decays. The atomic number and the mass number respectively of the resulting radionuclide are
(1) 92 and 234
(2) 94 and 230
(3) 90 and 230
(4) 92 and 230
55. The half-life of a radioactive isotope is 3 h. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 h would be
(1) 4.0 g
(2) 8.0 g
(3) 12.0 g
(4) 16.0 g
56. Several blocks of magnesium are fixed to the bottom of a ship to
(1) keep away the sharks
(2) make the ship lighter
(3) prevent action of water and salt
(4) prevent puncturing by under-sea rocks
57. In curing cement plasters water is sprinkled from time to time. This helps in
(1) keeping it cool
(2) developing interlocking needle-like crystals of hydrated silicates
(3) hydrating sand and gravel mixed with cement
(4) converting sand into silicic acid
58. Which one of the following statements is not true?
(1) The conjugate base of H2PO4− is HPO42−
(2) pH + pOH = 14 for all aqueous solutions
(3) The pH of 1 × 10−8 M HCl is 8
(4) 96,500 C of electricity when passed through a CuSO4 solution deposit 1g equivalent of copper at the cathode
59. The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH is
(1) CH3NH2 < NH3 < (CH3)2NH
(2) (CH3)2NH < NH3 < CH3NH2
(3) NH3 < CH3NH2 < (CH3)2NH
(4) CH3NH2 < (CH3)2NH < NH3
60. Butene-1 may be converted to butane by reaction with
(1) Zn-HCl
(2) Sn-HCl
(3) Zn-Hg
(4) Pd/H2
61. The solubilities of carbonates decrease down the magnesium group due to a decrease in
(1) lattice energies of solids
(2) hydration energies of cations
(3) inter-ionic attraction
(4) entropy of solution formation
62. During dehydration of alcohols to alkenes by heating with concentrated H2SO4 the initiation step is
(1) protonation of alcohol molecule
(2) formation of carbocation
(3) elimination of water
(4) formation of an ester
63. Which one of the following nitrates will leave behind a metal on strong heating?
(1) Ferric nitrate
(2) Copper nitrate
(3) Manganese nitrate
(4) Silver nitrate
64. When rain is accompanied is by a thunderstorm, the collected rain water will have a pH value
(1) slightly lower than that of rain water without thunderstorm
(2) slightly higher than that when the thunderstorm is not there
(3) uninfluenced by occurrence of thunderstorm
(4) which depends on the amount of dust in air
65. Complete hydrolysis of cellulose gives
(1) D-fructose
(2) D-ribose
(3) D-glucose
(4) L-glucose
66. For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be
(1) mercury
(2) tin
(3) sodium
(4) magnesium
67. The substance not likely to contain CaCO3 is
(1) a marble statue
(2) calcined gypsum
(3) sea shells
(4) dolomite
68. The reason for double helical structure of DNA is operation of
(1) van der Waal’s forces
(2) dipole-dipole interaction
(3) hydrogen bonding
(4) electrostatic attractions
69. Bottles containing C6H5I and C6H5CH2I lost their original labels. They were labelled A and B for testing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each tube was made acidic with dilute HNO3 and then some AgNO3 solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment?
(1) A was C6H5I
(2) A was C6H5CH2I
(3) B was C6H5I
(4) Addition of HNO3 was necessary
70. Ethyl isocyanide on hydrolysis in acidic medium generates
(1) ethylamine salt and methanoic acid
(2) propanoic acid and ammonium salt
(3) ethanoic acid and ammonium salt
(4) methylamide salt and ethanoic acid
71. The internal energy change when a system goes from state A to B is 40 kJ/ mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy
(1) 40 kJ
(2) > 40 kJ
(3) < 40 kJ
(4) zero
72. The reaction of chloroform with alcoholic KOH and p-toluidine form
(1) 
(2) 
(3) 
(4) 
73. Nylon threads are made of
(1) polyvinyl polymer
(2) polyester polymer
(3) polyamide polymer
(4) polyethylene polymer
74. On mixing a certain alkane with chlorine and irradiating it with ultraviolet light, it forms only one monochloroalkane. This alkane could be
(1) propane
(2) pentane
(3) isopentane
(4) neopentane
75. Which of the following could act as a propellant for rockets?
(1) Liquid hydrogen + liquid nitrogen
(2) Liquid oxygen + liquid argon
(3) Liquid hydrogen + liquid oxygen
(4) Liquid nitrogen + liquid oxygen
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