Aieee Chemistry 2006

AEEE –Past papers CHEMISTRY - UNSOLVED PAPER - 2006

SECTION – I Straight Objective Type This section contains multiple choice questions numbered 55 . Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.

01 Problem HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give CH3CHO and CH3Br BrCH2CHO and CH3OH BrCH2 – CH2 – OCH3 H3C – CHBr – OCH3

Problem 02 The IPUAC name of the compound shown below is : 2-bromo-6-chlorocyclohex-1-ene 6-bromo-2-chlorocyclohexene 3-bromo-1-chlorocyclohexene 1-bromo-3-chlorocyclohexene

Problem 03 The increasing order of the rate of HCN addition to compounds A-D is : HCHO CH3COCH3 PhCOCH3 PhCOPh A < B < C < D D < B < C < A D < C < B < A C < D < B < A

Problem 04 How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms ? 0.02 3.125 x 10-2 1.25 x 10-2 2.5 x 10-2

Problem 05 According to Bohr’s theory, he angular momentum of an electron in 5th orbit is : 25 b. 1.0 c. 10 d. 2.5

Problem 06 Which of the following molecules/ions does not contain unpaired electrons ? O B2 N O2

Problem 07 Total volume of toms present in a face-centred cubic unit cell of metal is (r is atomic radius) : a. b. c. d.

Problem 08 A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will: Remain unchanged Triple Increases by a factor of 4 Double

Problem 09 Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4 ? 2HI + H2SO4 I2 + SO2 + 2H2O Ca(OH)2 + H2SO4 CaSO4 + 2H2O NaCl + H2SO4 NaHSO4 + HCl 2PCl5 + H2SO4 2POCl3 + 2HCl + SO2Cl2

Problem 10 The IUPAC name for he complex [Co(NO2)(NH3)5]Cl2 is : Nitrite-N-pentaminecobalt (III) chloride Nitrite-N-pentamminecobalt (II) chloride Pentammine nitrite-N-cobalt (II) chloride Pentaamine nitrite-N-cobalt (III) chloride

Problem 11 The term anomers of glucose refers to : Isomers of glucose that differ configuration at carbons one and four (C-1 and C - 4) A mixture of (D)-glucose and (L)- glucose Enantiomers of glucose Isomers of glucose that differ in configuration at carbon one (C - 1)

Problem 12 In the transformation of if one emission is an -particle, what should be the other emission (s) ? Two -β Two -βand one + β One β and one One β and one β

Problem 13 Phenyl magnesium bromide reacts with methanol to give : A mixture of anisol and Mg(OH)Br A mixture of benzene and Mg(OMe)Br A mixture of toluence and Mg(OH)Br A mixture Phenol and Mg (Me)Br

Problem 14 The decreasing order of the rate of the above reaction with nucleophiles (Nu-) A to D is : [Nu- = (A) PhO-, (B)AcO-, (C) HO-, (D) CH3O-] D > C > A < B D > C > B > A A > B > C > D B > D > C > A

Problem 15 The pyrimidine bases present in DNA are : Cytosine and adenine Cytosine and guanine Cytosine and thymine Cytosine and uracil

Problem 16 Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is : a. CH3CH2CH(OH)CH2CH3 b. C6H5CH2CH2OH PhCHOHCH3

Problem 17 The increasing order of stability of the following free radicals is : (CH3)2 H < (CH3)3 < (C6H5)2 H < (C6H5)3 (C6H5)3 (C6H5)2 H< (CH3)3 < (CH3)2 H (C6H5)2 H<(C6H5)3 <(CH3)3 < (CH3)2 H (CH3)2 H < (CH3)3 < (C6H5)3 < (C6H5)2 H

Problem 18 Uncertainty in the position of an electron (mass = 9.1 x 10-31 kg) moving with a velocity 300 ms-1, accurate upon 0.001% will be : 19.2 x 10-2 m 5.76 x 10-2 m 1.92 x 10-2 m 3.84 x 10-2 m (h= 6.63 x 10-34 Js)

Problem 19 Phosphorus pentachloride dissociates as follows, in a closed reaction vessel, If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the partial pressure of PCl3 will be: a. b. c. d.

Problem 20 The standard enthalpy of formation at 298 K for methane, CH4(g), is -78.4 kJ mol-1. The additional information required to determine the average energy for C-H bond formation would be: The dissociation energy of H2 and enthalpy of sublimation of carbon Latent heat of vaporization of methane The first four ionization energies of carbon and electron gain enthalpy of hydrogen The dissociation energy of hydrogen molecule, H2

Problem 21 Among the following mixtures, dipole-dipole as the major interaction, is present in: Benzene and ethanol Acetonitrile and acetone KCl and water Benzene and carbon tetrachloride

Problem 22 Fluorobenzene (C6H5F) can be synthesized in the laboratory: By heating phenol with HF and KF From aniline by diazotization followed by heating the diazonium salt with HBF4 By direct fluorination of benzene with F2 gas By reacting bromobenzene with NaF solution

Problem 23 A metal, M forms chlorides in its + 2 and + 4 oxidation states. Which of the following statements about these chlorides is correct? MCl2 is more volatile than MCl4 MCl2 is more soluble in anhydrous ethanol than MCl4 MCl2 is more ionic than MCl4 MCl2 is more easily hydrolysed than MCl4

Problem 24 Which of the following statement is true ? H3PO3 is stronger acid than H2SO3 In aqueous medium HF is a stronger acid than HCl HClO4 is a weaker acid than HClO3 HNO3 is a stronger acid than HNO2

Problem 25 The molar conductivities at infinite dilution in water at 250C are 91.0 and 426.2 S cm2/ mol respectively. To calculate the additional value required is: a. b. c. d.

Problem 26 Which one of the following sets of ions represents a collection of isoelectronic species ? K+, Cl-, Ca2+, Sc3+ Ba2+, Sr2+, K+, S2- N3-, O2-, F-, S2- Li+, Na+, Mg2+, Ca2+

Problem 27 The correct order of increasing acid strength of the compounds: CH2CO2H MeOCH2CO2H CF3CO2H B < D < A < C D < A < C < B D < A < B < C A < D < C < B

Problem 28 In which of the following molecules/ions all the bonds are not equal? SF4 SiF4 XeF4 BF4

Problem 29 What products are expected from the disproportionation reaction of hypochlorous acid? HClO3 and Cl2O HClO2 and HClO4 HCl and Cl2O HCl and HClO3

Problem 30 Nickel (Z = 28) combines with a uninegativemonodentateligand X- to form a paramagnetic complex [NiX4]2-. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively : One, tetrahedral Two, tetrahedral One, square planar Two, square planar

Problem 31 In Fe(CO)s, the Fe-C bond possesses: Character only Both and characters Ionic character Character only

Problem 32 The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is : F < S < P < B P < S < B < F B < P < S < F B < S < P < F

Problem 33 An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system, If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct ? (Tf)irrev > (Tf)rev Tf > Ti for reversible process but Tf = Ti for irreversible process (Tf)rev = (Tf)irrev Tf = Ti for both reversible and irreversible

Problem 34 In languir’s model of adsorption of a gas on a solid surface : The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered The adorption at a single site on the surface may involve multiple molecules at the same time The mass of gas striking a given area of surface is proportional to the pressure of the gas The mass of gas striking a given area of surface is independent of the pressure of the gas

Problem 35 Rate of a reaction can be expressed by Arrhenius equation as: k = A e−E /RT In this equation, E represents the energy above which all the colliding molecules will react the energy below which colliding molecules will not react the total energy of the reacting molecules at a temperature, T the fraction of molecules with energy greater than the activation energy of the reaction

Problem 36 The structure of the major product formed in the following reaction is : a. b. c. d.

Problem 37 Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces: 4-phenylcyclopentene 2-phenylcylocpentene 1-phenylcylopentene 3-phenylcylopentene

Problem 38 Increasing order of stability among the three main conformations (i.e., Eclipse, Anti, Gauche) of 2-fluoroethanol is : Eclipse, Gauche, Anti Gauche, Eclipse, Anti Eclipse, Anti, Gauche Anti, Gauche, Eclipse

Problem 39 The structure of the compound that gives a tribromo derivative on treatment with bromine water is a. b. c. d.

Problem 40 The decreasing values of bond angles form NH3(1060) to SbH3(1010) down group-15 of the periodic table is due to: Increasing bp-bp repulsion Increasing p-orbital character in sp3 Decreasing lp-bp repulsion Decreasing electronegativity

Problem 41 The alkene formed as a major product in the above elimination reaction is The ‘spin-only’ magnetic moment [in units of Bohr magneton, ( )] of Ni2+ in aqueous solution would be (Atomic number of Ni = 28) : a. b. c. d.

Problem 42 The ‘spin – only’ magnetic moment in uints of Bohr magneton, of Ni2+ in aueous solution would be (automatic number of Ni =28): 2.84 4.90 0 1.73

Problem 43 The equilibrium constant for the reaction is Kc= 4.9 x 10-2. The value of Kc for the reaction will be: 416 2.40 x 10-3 9.8 x 10-2 4.9 x 10-2

Problem 44 Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture? The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Problem 45 Given the data at 250C, Ag + I-AgI + e- ; E0 = 0.152 V Ag Ag+ + e - ; E0 = - 0.800 V What is the value of log Ksp for AgI ? -8.12 + 8.612 - 37.83 - 16.13

Problem 46 The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr: NO(g) + Br2(g) NOBr2 (g) NOBr2 (g) + NO (g) 2NOBr(g) If the second step is the rate determining step, the order of the reaction with respect to NO (g) is : 1 0 3 2

Problem 47 Lanthanoid contraction is caused due to : The appreciable shielding on outer electrons by 4f electrons from the nuclear charge The appreciable shielding on outer electrons by 5d electrons from the nuclear charge The same effective nuclear charge from Ce to Lu The imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Problem 48 Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.01 M is 100 . The conductivity of this solution is 1.29 S m-1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 . The molar conductivity of 0.02 M solution of the electrolyte will be : 124 x 10-4 S m2 mol-1 1240 x 10-4 S m2 mol-1 1.24 x 10-4 S m2 mol-1 12.4 x 10-4 S m2 mol-1

Problem 49 The ionic mobility of alkali metal ions in aqueous solution is maximum for : K+ Rb+ Li+ Na+

Problem 50 Density of a 2.05 M solution of acetic acid in water is 1.02 g/ml. The molality of the solution is : 1.14 mol kg-1 3.28 mol kg-1 2.28 mol kg-1 0.44 mol kg-1

Problem 51 The enthalpy changes for the following processes are listed below : Cl2(g) = 2Cl(g), 242.3 kJ mol-1 I2(g) = 2I (g), 151.0 kJ mol-1 ICl (g) = I (g) + Cl (g), 211.3 kJ mol-1 I2(s) = I2 (g), 62.76 kJ mol-1 Given that the standard states for iodine and chlorine are I2(s) and Cl2(g), the standard enthalpy of formation of ICI (g) is : - 14.6 kJ mol-1 -16.8 kJ mol-1 + 16.8 kJ mol-1 + 244.8 kJ mol-1

Problem 52 How many EDTA (ethylenediaminetetra acetic acid) molecules are required to make an octanhedral complex with a Ca2+ ion? Six Three One Two

Problem 53 The electrophile involved in the above reaction is : Dichloromethylcation ( HCl2) Dichlorocarbene (: CCl2) Trichloromethyl anion ( Cl2) Formylcation ( HO)

Problem 54 18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 1000C is : 759.00 torr 7.60 torr 76.00 torr 752.40 torr

Problem 55 for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 JK-1 mol-1) -1238.78 J mol-1 1238.78 J mol-1 -2477.57 J mol‑1 2477.57 J mol-1

FOR SOLUTION VISIT WWW.VASISTA.NET

Aieee Chemistry 2006

Recomendados

Recomendados

Más contenido relacionado

La actualidad más candente

La actualidad más candente (18)

Similar a Aieee Chemistry 2006

Similar a Aieee Chemistry 2006 (17)

Más de Vasista Vinuthan

Más de Vasista Vinuthan (20)

Último

Último (20)

Aieee Chemistry 2006

Notas del editor