amu - chemistry - 2005

AMU –PAST PAPERS

CHEMISTRY- UNSOLVED PAPER - 2005

SECTION – I

Single Correct Answer Type There 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

01A solution is prepared by dissolving 24.5 g of sodium hydroxide in distilled water

to give 1 L solution. The molarity of NaOH in the solution is :

a. 0.2450 M

b. 0.6125 M

c. 0.9800 M

d. 1.6326 M

(Given that molar mass of NaOH = 40.0 g mol-1)

Problem

02An electron with values 4, 3, -2 and + for the set of four quantum numbers n, l,

ml and ms, respectively belongs to :

a. 4 s orbital

b. 4 p orbital

c. 4 d orbital

d. 4 f orbital

Problem

Problem03The electronic configuration

can be assigned to :

a. O2

b. O

c. O

d. O

2 2 2 2 2 2 2 1( 1 ) ( * 1 ) ( 2 ) ( 2 ) ( 2 ) ( 2 ) ( * 2 ) ( * 2 )x y z y zs s s p p p p p

2

2

22

Problem04What is the number of tetrahedral voids per atom in a crystal ?

a. 1

b. 2

c. 6

d. 8

Problem05In a osmotic pressure measurement experiment, a 5% solution of compound ‘X’ is

found to be isotonic with a 2% acetic acid solution. The gram molecular mass of

‘X’ is :

a. 24

b. 60

c. 150

d. 300

Problem06On passing 0.5 Faraday of electricity through molten sodium chloride, sodium

deposited at cathode will be :

a. 29.25 g

b. 11.50 g

c. 58.50 g

d. 0.0g

Problem07The rate constant of a reaction is 3.00 x 103 L mol-1 sec-1. The order of this reaction

will be :

a. Zero

b. First

c. Second

d. Third

Problem08The value of E for combustion of 16 g of CH4 is – 885389 J at 298 K. The H

combustion of CH4 in J mol-1 at this temperature will be :

a. - 55337

b. - 880430

c. - 885389

d. - 890348

(Given that R = 8.314 JK-1 mol-1)

Problem09When two moles of hydrogen expands isothermally against a constant pressure of

1 atm, at 250C from 15 L to 50 L, the work done (in litre atm) will be :

a. 17.5

b. 35

c. 51.5

d. 70

Problem10The enthalpy change for the transition of liquid water to steam is 40.8 kJ per

mol at 1000C. The entropy change for the process will be :

a. 0.408 JK-1 mol-1

b. 408 JK-1 mol-1

c. 109.4 JK-1 mol-1

d. 0.1094 JK-1 mol-1

Problem11The entropy change for the reaction H2(g) + Cl2(g) 2 HCl(g), will be :

a. 20 JK-1 mol-1

b. - 20 JK-1 mol-1

c. 167 JK-1 mol-1

d. -167 JK-1 mol-1

[Given that S0 (HCl) = 187 JK-1 mol-1, So(H2) = 131 JK-1 mol-1, and So(Cl2) = 233 JK-1

mol-1]

Problem12If the temperature of 500 mL of air increases from 270C to 420C under

constant pressure, then the increase in volume shall be :

a. 15 mL

b. 20 mL

c. 25 mL

d. 30 mL

Problem13Which of the following pair of structures is an example of diastereomers ?

a.

b.

c.

d.

Problem14Which of the following pair of compounds is not an example of structural

isomers ?

a.

b.

c.

d.

Problem15The systematic (IUPAC) name of the compound with the following structural

formula shall be :

a. 1-ethyl-2-methyl cyclohexene

b. 2-methyl-1-2thyl cyclohexene

c. 3-ethyl-2-methyl cyclohexene

d. 4-ethyl-3-methyl cyclohexene

Problem16Which of the following compounds will form alcohol on treatment with NaNO2,

HCl/H2O at 00C

a. (CH3)2CHNH2

b. C6H5NH2

c.

d.

Problem17In the nucleophilic substitution reactions (SN2 or SN1), the reactivity of

alkylhalides follows the sequence :

a. R – I > R – Br > R – Cl > R - F

b. R – Cl > R – F > R – Br > R – 1

c. R – F > R – Cl > R – Br > R- I

d. R – I > R – F > R – Cl > R – Br

Problem18Compound ‘A’ reacts with alcoholic KOH to yield compound ‘B’, which on

ozonolysis followed by reaction with Zn/H2O gives methanal and propanal.

Compound ‘A’ is :

a. 1-propanol

b. 1-butanol

c. 1-chlorobutane

d. 1-chloropentane

Problem19In the reaction sequence

Compound ‘X’ is:

a. Chlorobenzene

b. Benzene

c. Toluene

d. Biphenyl methane

Problem20In the sequence of reactions Z, compound ‘Z’

is :

a. N-methyl ethanamine

b. N-propylamine

c. N,N-dimehtylamine

d. Ethyl cyanide

2

[ ]2 4 /

HBr AgCN HH NiC H X Y

Problem21In the reaction sequence, compound ‘A’ is :

a. 1-propanol

b. propanal

c. ethanal

d. 2-propanol

3 2 35 12

CH CH MgBr H OA B C H O

Problem22Which of the following compounds is weakest acid ?

a.

b.

c.

d

Problem23The acetophenone can be converted to ethylbenzene by reaction with :

a. LiAlH4

b. H2NOH

c. Pd/BaSO4 – H2

d. Zn – Hg/HCl

Problem24Which of the following hydroxides is amphoteric in nature ?

a. Be(OH)2

b. Mg(OH)2

c. Ca(OH)2

d. Ba(OH)2

Problem25Number of electrons in 3d orbital of V2+, Cr2+, Mn2+ and Fe2+ are 3, 4, 5 and 6,

respectively. Which of the following ions will have largest value of magnetic

moment ( ) ?

a. V2+

b. Cr2+

c. Mn2+

d. Fe2+

Problem26The co-ordination compounds [Co(NH3)6]3+ [Cr(CN)6]3- and [Co(NH3)6]3+

[Cr(CN)6]3- are the examples of :

a. Linkage isomerism

b. Co-ordination isomerism

c. Ionization isomerism

d. Geometrical isomerism

Problem27The spontaneous disintegration U by loss of eight -particles and six -particles

terminates at :

a. Ra

b. Po

c. Th

d. Pb

23892

21082

21084

22890

20682

Problem28The relative Lewis acid character of boron trihalides follows the sequence :

a. BF3 > BCl3 > BBr3 > BI3

b. BI3 > BBr3 > BCl3 > BF3

c. BCl3 > BF3 > BI3 > BBr3

d. BI3 > BBr3 > BF3 > BCl3

Problem29The tendency for catenation in Group 14 elements varies in the order :

a. C >> Si > Ge = Sn > Pb

b. C << Si < Ge = Sn < Pb

c. C >> Si < Ge < Sn < Pb

d. C >> Si = Ge = Sn > Pb

Problem30The thermal stability of CF4 is :

a. Less than SiF4

b. More than SiF4

c. Less than CCl4

d. Less than SiCl4

Problem31Which of the following enzymes hydrolyses starch to glucose ?

a. Amylase

b. Invertase

c. Lactase

d. Maltase

Problem32Which of the following reactions is an example of heterogeneous catalysis ?

a. O3 + O 2 O2 (gas phase)

b. 2 CO(g) + O2(g) 2 CO2(g)

c.

d. CO(g) + 2H2 (g)

CH3OH(l)

Cl NO

2 3,Cu ZnO Cr O

Problem33If one strand of DNA has the sequence T A T G A C T G, the sequence in the

complimentary strand would be :

a. A T A C A C T C

b. A C G T T G A C

c. A T A C T G A C

d. A T A C T G C A

Problem34Which of the following hormones is excreted from adrenal cortex ?

a. Cortisone

b. Estrogen

c. Progesterone

d. Testosterone

Problem35Which of the following compounds is an azo dye ?

a. Martius yellow

b. Malachite green

c. Methyl orange

d. Mercurochrome

Problem36Which of the following is a thermosetting polymer ?

a. Bakelite

b. Polystyrene

c. Polyethene

d. Terylene

Problem37The carbohydrate that will yield glucose and fructose on homogeneous catalytic

hydrolysis in presence of dilute sulphuric acid, is :

a. Cellulose

b. Maltose

c. Starch

d. Sucrose

Problem38The gas that is not considered as a ‘green house gas’ is :

a. CO2

b. CH4

c. O2

d. O3

Problem39The enzyme that is used to dissolve blood clot is :

a. Trypsin

b. Renin

c. Streptokinase

d. Tyrosinase

Problem40Which of the following compounds is known as the antisterlity factor ?

a. -tocopherol

b. Retinol

c. Calciferol

d. Pyridoxine

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