AIEEE Chemistry 2002

AEEE –Past papers CHEMISTRY - UNSOLVED PAPER - 2006

SECTION – I Straight Objective Type This section contains multiple choice questions numbered 75. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.

Problem 01 Which of the following is a redox reaction ? NaCl + KNO3 NaNO3 + KCl CaC2O4 + 2HCl CaCl2 + H2C2O4 Ca(OH)2 + 2NH4Cl CaCl2 + 2NH3 + 2H2O 2K[Ag(CN)2] + Zn 2Ag + K2 [Zn(CN)4]

Problem 02 For an ideal gas, number of mol per litre in terms of its pressure P, temperature T and gas constant R is : PT/R PRT P/RT RT/P

Problem 03 Number of P – O bonds in P4O10 is : 17 16 15 6

Problem 04 KO2 is used in space and submarines because it : Absorbs CO2 and increases O2 concentration Absorbs moisture Absorbs CO2 Produces ozone

Problem 05 Which of the following ions has the maximum magnetic moment ? Mn2+ Fe2+ Ti2+ Cr2+

Problem 06 Acetylene does not react with : Na Ammonical AgNO3 HCl NaOH

Problem 07 Compound A given belowis : Antiseptic Antibiotic Analgesic Pesticide

Problem 08 For the following cell with hydrogen electrodes at two different pressures p1 and p2 Pt (H2) | H+(aq.) | Pt (H2) p1 1M p2 emf is given by : a. b. c. d.

Problem 09 Acetylene reacts with hypochlorous acid to form : Cl2CHCHO ClCH2COOH CH3COCl ClCH2CHO

Problem 10 On heating benzyl amine with chloroform and ethanolic KOH, product obtained is : Benzyl alcohol Benzaldehyde Benzonitrile Benzyl isocyanide

Problem 11 Which of the following reaction is possible at anode ? a. b. c. d.

Problem 12 Which of the following concentration factor is affected by change in temperature ? Molarity Molality Mol fraction Weight fraction

Problem 13 Cyanide process is used for the extraction of : Barium Silver Boron Zinc

Problem 14 Following reaction (CH3)3CBr + H2O (CH3)3COH + HBr is an example of : Elimination reaction Free radical substitution Nucleophilic substitution Electrophilic substitution

Problem 15 A metal M forms water soluble MSO4 and inert MO. MO in aqueous solution forms insoluble M(OH)2 soluble in NaOH. Metal M is : Be Mg Ca Si

Problem 16 Half life of a substance A following first order kinetics is 5 days. Starting with 100 g of A, amount left after 15 days is : 25 g 50 g 12.5 g 6.25 g

Problem 17 The most stable ion is : [Fe(OH)5]3- [FeCl6]3- [Fe(CN)6]3- [Fe(H2O)6]3+

Problem 18 A substance forms zwitter ion. It can have functional groups : - NH2, - COOH - NH2, - SO3 H Both None of these

Problem 19 If Fe3+ and Cr3+ both are both are present in group III of qualitative analysis, then distinction can be made by : Addition of NH4OH in presence of NH4Cl when only Fe(OH)3 is precipitated Addition of NH4OH in presence of NH4Cl when Cr(OH)3 and Fe(OH)3 both are precipitated and on adding Br2 water and NaOH, Cr(OH)3 dissolves Precipitate of Cr(OH)3 and Fe(OH)3 as obtained in (b) are treated with conc. HCl when only Fe(OH)3 dissolves (b) and (c) the correct

Problem 20 In an organic compound of molar mass 108 g mol-1 C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular formula can be : C6H8N2 C7H10N C5H6N3 C4H18N3

Problem 21 Solubility of Ca(OH)2 is S mol litre-1. the solubility product (Ksp) under the same condition is : 4S3 3S4 4S2 S3

Problem 22 Heat required to raise the temperature of 1 mol of a substance by 10 is called : Specific heat Molar heat capacity Water equivalent Specific gravity

Problem 23 β- particle is emitted in a radioactive reaction when A proton changes to neutron A neutron changes to proton A neutron changes to electron An electron changes to neutron

Problem 24 In a mixture of A and B, components show negative deviation when : A – B interaction is stronger than A – A and B – B interaction A – B interaction is weaker than A – A and B – B interaction Vmix > 0, Smix > 0 Vmix = 0, Smix > 0

Problem 25 Refining of impure copper with zinc impurity is to be done by electrolysis using electrons as : Cathode Anode Pure cop pure zinc Pure zinc pure copper Pure copper impure copper Pure zinc impure zinc

Problem 26 Aluminium is extracted by the electrolysis of : Alumina Bauxite Molten cryolite Alumina mixed with molten cryolite

Problem 27 For an aqueous solution, freezing point is – 0.1860C. Elevation of the boiling point of the same solution is (Kf = 1.860 mol-1 kg and Kb = 0.5120 mol-1 kg) : 0.1860 0.05120 1.860 5.120

Problem 28 Underlined carbon is sp3hybridised in : CH3 H = CH2 CH3 H2NH2 CH3 ONH2 CH3 CH2 N

Problem 29 Bond angle of 109028’ is found in : NH3 H2O

Problem 30 For a reaction , rate is given by + hence the order of the reaction is : 3 2 1 0

Problem 31 CH3MgI is an organometalliccompound due to : Mg – I bond C – I bond C – Mg bond C – H bond

Problem 32 One of the following species acts as both Bronsted acid and base : H2PO HPO HPO All of the above

Problem 33 Hybridisation of the underline atom changes in : a. b. c. d. In all cases

Problem 34 Racemic mixture is formed by mixing two : Isomeric compounds Chiral compounds Meso compounds Enantiomers with chiral carbon

Problem 35 The number of lone pairs on Xe in XeF2, XeF4 and XeF6 respectively are : 3, 2, 1 2, 4, 6 1, 2, 3 6, 4, 2

Problem 36 An aqueous solution of 1 M NaCl and 1M HCl is : Not a buffer but pH < 7 Not a buffer but pH > 7 A buffer with pH < 7 A buffer with pH > 7

Problem 37 Consider following tow reactions k1 and k2 are expressed in terms of molarity (mol L-1) and time (sec-1) as : sec-1, M sec-1 L-1 M sec-1, M sec-1 sec-1, M sec-1 M sec-1, L-1 sec-1

Problem 38 RNA contains : Ribose sugar and thymine Ribose sugar and uracil Deoxyribose sugar and uracil Deoxyribose sugar and thymine

Problem 39 For a cell given below : Ag |Ag+ | | Cu2+ +| Cu E0 = x E0 = y E0 cell is : x + 2y 2x + y y – x y – 2x

Problem 40 Based on kinetic theory of gases following laws can be proved : Boyle’s law Charle’s law Avogadro’s law All of these

Problem 41 MnO is a good oxidizing agent in different medium changing to MnO-4 Mn2+ MnO2-4 MnO2 Mn2O3 Changes in oxidation number respectively are : 1, 3, 4, 5 5, 4, 3, 2 5, 1, 3, 4 2, 6, 4, 3

Problem 42 For the reaction : H2 + I2 2HI, the differential rate law is : a. b. c. d.

Problem 43 Number of atoms in 560 g of Fe (atomic mass 56 g mol-1) is : Is twice that of 70 g N Is half that of 20 g H Both are correct None is correct

Problem 44 Geometrical isomerism is not shown by : 1, 1-dicholoro-1-pentene 1, 2-dichloro-1-pentene 1, 3-dichloro-2-pentene 1.4-dichloro-2-pentene

Problem 45 Number of atoms in the unit cell of Na (BCC type crystal) and Mg (FCC type crystal) are respectively : 4, 4 4, 2 2, 4 1, 1

Problem 46 Which of the following compounds has incorrect IUPAC nomenclature ? 2-methyl-3-pentanone CH3CHCHCH3 | | Ethylbutanoate H3C OH 2-methyl-3-butano 3methyl butanal End product of the following reaction is : (RT)1/2 (RT)-1/2 (RT) (RT)-1

Problem 47 Which of the following compounds has incorrect IUPAC nomenclature ? 2-methyl-3-pentanone CH3CHCHCH3 | | Ethylbutanoate H3C OH 2-methyl-3-butano 3methyl butanal End product of the following reaction is : (RT)1/2 (RT)-1/2 (RT) (RT)-1

Problem 48 For the following reactions in gaseous phase is : (RT)1/2 (RT) -1/2 (RT)-1 (RT)

Problem 49 Energy of H-atom in the ground state is – 13.6 eV, hence energy in the secnd excited state is : - 6.8 eV -3.4 eV - 1.51 eV - 4.53 eV

Problem 50 A square planar complex is formed by hybridization of the following atomic orbitals : s, Px, Py, Pz s, Px, Py, Pz, d d, s, Px, Py s, Px, Py, Pz, d, d

Problem 51 Type of isomerism shown by [Cr(NH3)5NO2]Cl2 is : Optical Ionization Geometrical Linkage

Problem 52 One of the following equilibrium is not affected by change in volume of the flask : PCl5(g) PCl3 (g) + Cl2(g) N2(g) + 3H2(g) 2NH3 (g) N2(g) + O2(g) 3NO(g) SO2Cl2(g) SO2(g) + Cl2(g)

Problem 53 Uncertainty in position of a particle of 25 g in space is 10-5 m. Hence uncertainty in velocity (ms-1) is (Planck’s constant h = 6.6 x 10-34 Js) : 2.1 x 10-28 2.1 x 10-34 0.5 x 10-34 5.0 x 10-24

Problem 54 Consider the following reactions at 11000C 2C + O2 2CO, = -460 kJ mol-1 2Zn + O2 2ZnO, = -360 kJ mol-1 Based on these, select correct alternate : Zinc can be oxidized by CO Zinc oxide can be reduced by carbon Both are correct None is correct

Problem 55 A reaction is non-spontaneous at the freezing point of water but is spontaneous at the boiling point of water then : H S +ve +ve -ve -ve -ve +ve +ve -ve

Problem 56 Monomers converted to polymer by: Hydrolysis of monomers Condensation reaction between monomers Protonation of monomers None is correct

Problem 57 Increasing order of bond strength of a.O2 b. c. d.

Problem 58 Most common oxidation states of Ce(Cerium) are : +3, +4 +2, +3 +2, +4 +3, +5

Problem 59 Ce3+, La3+, Pm3+ and Yb3+ have ionic radii in the increasing order as : La3+ < Ce3+ < Pm3+ < Yb3+ Yb3+ < Pm3+ < La3+ < Ce3+ La3+ = Ce3+ < Pm3+ < Yb3+ Yb3+ < Pm3+ < La3+ < Ce3+

Problem 60 pH of 0.005 M calcium acetate (pKa of CH3COOH = 4.74) is : 7.04 9.37 9.26 8.37

Problem 61 H2 gas is absorbed on the metal surface like tungsten. This follows ….. order reaction. Third Second Zero First

Problem 62 Rate constant k of the first order reaction when initial concentration C0 and concentration Ct at time t is given by equation kt = log C0 – log Ct Graph is a straight line if we plot : t vs log C0 t vs log Ct t-1vs long Ct log C0vs log C

Problem 63 Alum is widely used to purify water since : It forms complex with clay particles It coagulates the mud particles It exchanges Ca2+ and Mg2+ ions present in hard water Its sulphate ion is water purifier

Problem 64 On vigorous oxidation by permanganate solution (CH3)2 C = CHCH2CHO gives : In the following bynzyl/ally system Decreasing order of inductive effect is : (CH3)3C - > (CH3)2CH - > CH3CH2 – CH3CH2 - >(CH3)2CH - > (CH3)3C – (CH3)2CH - > CH3CH2 - > (CH3)3C – (CH3)2C- > CH3CH2 - > (CH3)3CH –

Problem 65 In the following benzyl / allyal system R-CH=CH2 or (R is alkyl group) decreasing order of inductive effect is : a. b. c. d.

Problem 66 PCI3 and PCI5 both exist; NCI3 exists but NCI5 does not exist. It is due to: Lower electro negativity of P then N Lower tendency of N to form covalent bond Availability of vacant d-obital in P but not in N Statement is itself incorrect

Problem 67 Following types of compounds (as I,II) Chain isomerism Position isomerism Conformers Stereoisomerism

Problem 68 Conductivity (seimen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel, then constant of proportionality is expressed in: S m mol-1 S2m2mol-2 S m2mol-1 S2m2mol

Problem 69 A heat engine absorbs heat q1 from a source at temperature T1 and heat q2 from a source at temperature T2. work done is found to be j(q1+q2).this is in accordance with : First law of thermodynamics Second law of thermodynamics Joules equivalent law None of the above

Problem 70 Select correct statement : When a covalent bond is formed, transfer of electrons takes place Pure H2O does not contain any ion A bond is formed is formed when attractive forces overcome repulsive forces HF is less polar than HBr

Problem 71 The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution, the deep blue colour is due to formation of: Solvated electron, e(NH3)-x Solvated atomic sodium, Na(NH3)y (Ma++Na) NaNH2+H2

Problem 72 Maximum dehydration takes place that of : a. b. c. d.

Problem 73 SN reaction is feasible in : a. b. c. d.

Problem 74 Oxidation number of CI in CaOCI (bleaching powder) is : Zero , since it contains Cl2 -1, since it contains Cl- +1, since it contains ClO- +1 and -1 since it containsClO- and Cl-

Problem 75 Picric acid is : a. b. c. d.

AIEEE Chemistry 2002

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