amu - chemistry - 2004

AMU –PAST PAPERS

CHEMISTRY- UNSOLVED PAPER - 2004

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

01The mass of a photon with wavelength 3.6 Å is :

a. 6.135 x 10-29 kg

b. 3.60 x 10-29 kg

c. 6.135 x 10-33 kg

d. 3.60 x 10-27 kg

Problem

02An electron with values 4, 2, -2 and +1/2 for the set of four quantum numbers n,

l, m1 and s respectively, belongs to :

a. 4s orbital

b. 4p orbital

c. 4d orbital

d. 4f orbital

Problem

Problem03The bond order of varies in the order :

a.

b.

c.

d.

22 2 2 2, ,O O O andO

22 2 2 2O O O O

22 2 2 2O O O O

22 2 2 2O O O O

22 2 2 2O O O O

Problem04Molecular orbital electronic configuration for ‘X’ anion is :

. The anion ‘X’ is :

a.

b.

c.

d.

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

2N

2O

22N

22O

Problem05Which of the following statements is incorrect ?

a. Pure aluminium oxide is obtained by heating aluminium hydroxide.

b. Cryolite lowers down the melting temperature of bauxite in the electrolytic

cell for extraction of aluminium.

c. Carbonate ores are converted into oxides by roasting ore in air.

d. Mercury cannot be produced by roasting the ore cinnabar in air.

Problem06The relative Lewis acid character of boron trihalides is in the order :

a. BI3 > BBr3 > BF3 > BCl3

b. BI3 > BBr3 > BCl3 > BF3

c. BF3 > BCl3 > BBr3 > Bl3

d. BCl3 > BF3 > BI3 > BBr3

Problem07Which of the following metals is most reactive towards water ?

a. Na

b. K

c. Rb

d. Cs

Problem08Which of the following molecules has pentagonal bipyramidal shape :

a. PF5

b. SF6l

c. XeF6

d. [Fe(CN)6]3-

Problem09The acidity of hydrides of O, S, Se, Te varies in the order :

a. H2O > H2S > H2Se > H2Te

b. H2O > H2S < H2Se < H2Te

c. H2S > H2O > H2Se > H2Te

d. H2Se > H2S > H2O > H2Te

Problem10The stability of complexes of Cu2+, Ni2+, Co2+ and Fe2+ varies in the order :

a. Cu2+ > Ni2+ > Co2+ > Fe2+

b. Cu2+ > Fe2+ > Ni2+ > Co2+

c. Ni2+ > Co2+ > Fe2+ > Cu2+

d. Cu2+ < Ni2+ < Co2+ < Fe2+

Problem11Which of the following compounds is generally used for hydrogenation of

alkenes ?

a. Ni(CO)4

b. [(C6H5)3P]3RhCl

c. (CH3)3Al

d. (C5H5)2Fe

Problem12The example of co-ordination isomerism is :

a. [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]

b. [Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br

c. [Co(NH3)5NO3]SO4 and [Co(NH3)5SO4]NO3

d. [Pt(NH3)4Cl2]Br2 and [Pt(NH3)4Br2]Cl2

Problem13Cow milk is an example of natural emulsion stabilized by :

a. Detergent

b. Fat

c. Casein

d. Urea

Problem14The molal elevation constant for water is 0-.52. What will be the boiling point of 2

molar sucrose solution at 1 atm. Pressure ? (Assume B.P. of pure water as 1000C) :

a. 101.040 C

b. 100.260 C

c. 100.520 C

d. 99.740 C

Problem15If at 250 C the ionization constant of acetic acid is 2 x 10-5, the hydrolysis

constant of sodium acetate will be :

a. 5 x 10-8

b. 5 x 10-9

c. 5 x 10-10

d. 4 x 10-10

Problem16The solubility product of Ag2CrO4 in water at 2908 K is 3.2 x 10-11. What will be

the concentration of CrO ions in the saturated solution of Ag2CrO4 ?

a. 2 x 10-4 m

b. 5.7 x 10-5 M

c. 5.7 x 10-6 M

d. 3.2 x 10-11

Problem17The pKb value of NH3 is 5. Calculate the pH of buffer solution, 1 L of which

contains 0.01 NH4Cl and 0.10 M NH4OH :

a. 4

b. 6

c. 8

d. 10

Problem18Calculate the entropy change for CH4(g) + H2O(g) 3H2(g) + CO(g), using the

following data :

The entropy change is :

a. - 46 JK-1mole-1

b. + 46 JK-1mole-1

c. - 214.5 JK-1mole-1

d. + 214.5 JK-1mole-1

Substance CH4(g) H2O(g) H2(g) CO(g)

So/JK-1 mole-1 186.2 188.7 130.6 197.6

Problem19The type of hybridization in XeF4 is :

a. dsp2

b. sp3d

c. sp3d2

d. sp3d3

Problem20given the electrode potentials

Fe3+ + e- Fe2+, Eo = 0.771 volts

I2 + 2e- 2I-,Eo = 0.536 volts

for the cell reaction

2Fe3+ 2I- 2Fe2+ + I2, is :

a. 1.006 V

b. 0.503 V

c. 0.235 V

d. - 0.235 V

0cellE

Problem21In the general nuclear reaction the product ‘D’ is :

a. -particle

b. -particle

c. -particle

d. proton

4 32 1 ' 'A A

Z ZX He Y D

Problem22Lassaigne’s test is not used for the detection of :

a. Carbon

b. Halogens

c. Nitrogen

d. Sculpture

Problem23Then number of isomeric alkenes with molecular formula C6H12 are :

a. 8

b. 10

c. 11

d. 13

Problem24Which of the following alkenes will yield 2-butaneone on ozonolysis followed by

the reaction with Zn/H2O ?

a. 2-Methyl-2-hexene

b. 2-Methyl-1-hexene

c. 3,4-Dimethyl1-e-hexene

d. 2, 3-Dimethyl-3-hexene

Problem25A bromoalkane ‘X’ reacts with magnesium in dry ether to from compound ‘Y’.

the reaction of ‘Y’ with methanal followed by hydrolysis yield an alcohol

having molecular formula C4H10O. The compound ‘X’ is :

a. Bromo ethane

b. Bromo methane

c. 1-bromo propane

d. 2-bromo propane

Problem26Which of the following compounds will not exhibit cis-trans isomerism ?

a.

b.

c.

d.

Problem27Which of the following molecule is achiral ?

a.

b.

c.

d.

Problem28Which of the following compounds will be most reactive towards nucleophilic

additon reaction ?

a. CH3COCH2CH2CH2CH3

b. CH3CH2COCH2CH2CH3

c. CH3CH2CH2CH2CH2CHO

d.

Problem29Which of the following compounds is the strongest acid ?

a. HCOOH

b. CH3COOH

c. Cl2CHCOOH

d. C6H5COOH

Problem30In the reaction sequence the product ‘C’ is :

a. Benzonitrile

b. Benzaldehyde

c. Benzoic

d. Benzlyamine

Problem31The basicity of compounds I, II, III and IV

CH3NH2, (CH3)2NH, (CH3)3N, C6H5CH2NH2

I II II IV

Varies in the order :

a. I > II > III > IV

b. II > I > III > IV

c. III > I > II > IV

d. IV > I > II > III

Problem32Diethyl oxalate is used for distinguishing primary, secondary and tertiary :

a. Alcohols

b. Amines

c. Alkyl halides

d. Hydrogens in hydrocarbons

Problem33The brown haze of photochemical smong is largely attributable to :

a. NO

b. NO2

c.

d. CH2 = CHCH = O

Problem34The water pollutants mainly responsible for eutrophication are :

a. Cd, Pb and Hg present in industrial waste

b. Heavy metals present in mining waste

c. Detergents and fertilizes containing phosphate anion

d. Polychlorinated biphenyls

Problem35Which of the following is a thermosetting polymer ?

a. Polyethene

b. Bakelite

c. Terylene

d. Polystyrene

Problem36Which of the following is an example of conjugated protein ?

a. Albumin

b. Globulin

c. Glutelin

d. Glycoprotein

Problem37If one strand of DNA has the sequence ATCGTATG, the sequence in the

complementary strand would be :

a. TAGCTTAC

b. TCACATAC

c. TAGCATAC

d. TACGATAC

Problem38Fluorescein in an example of :

a. Azo dyes

b. Phthalein dyes

c. Triphenyl methane dyes

d. Nitro dyes

Problem39Amphetamine is used as:

a. Anaesthetic

b. Antidepressant

c. Antimalarial

d. Anagesic

Problem40Which of the following compounds is used as broad spectrum antibiotics ?

a. Ampicillin

b. Penicillin G

c. Penicillin K

d. Tetracyline

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