AIPMT–PAST PAPERS

CHEMISTRY- UNSOLVED PAPER - 2008

SECTION – I (Total Marks : 50)

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

01Which one of the following arrangements does not give the correct picture

of the tends indicated against it?

a.

b.

c.

d.

Problem

2 2 2 2F > Cl > Br > I : Bond dissociation energy

2 2 2 2F > Cl > Br > I : Electronegativity

2 2 2 2F > Cl > Br > I : Oxidizing power

2 2 2 2F > Cl > Br > I : Electron gain enthalpy

Problem02If a gas expand at a constant temperature, it indicate that

a. Kinetic energy of molecule remain the same

b. Number of molecule of gas increase

c. Kinetic energy of molecule decrease

d. Pressure of the gas increase

Problem03The dissociation equilibrium of a gas AB2 can be represented as:

The degree of dissociation is x & is smaller

compared to 1. The expression to 1. The expressing relating the degree of

dissociation (x) with equilibrium constant & total pressure P is

a.

b.

c.

d.

2( ) ( ) 2( )2 2g g gAB AB B

1/2

p2K /P

pK /P

p2K /P1/3

p2K /P

Problem04The bromination of acetone that occurs in acid solution is represented by this

equation These kinetic data

were obtained for given reaction concentration. Initial concentration, M

Initial rate, disappearance of

Initial rate, disappearance of

a.

b.

c.

d.

+ -

3 3(ag) 2(ag) 3 2 (ag) (ag) (ag)CH COCH + Br CH COCH Br + H + Br

0.30 0.05 0.05

0.30 0.10 0.05

0.30 0.10 0.10

0.40 0.05 0.20

2Br +H3 3CH COCH

-1

2Br , Ms

-55.7 x 10

-55.7 x 10

-41.2 x 10

-43.1 x 10

Problem

Based on these data, the rate equation is

a.

b.

c.

d.

2+

3 3 2Rate = k CH COCH Br H

+

3 3 2Rate = k CH COCH Br H

2+

3 3Rate = k CH COCH H

3 3 2Rate = k CH COCH Br

Problem05If the concentration of OH- ions in the reaction

Is decreased by 1/4times, then equilibrium concentration of will increased by

a. 64 times

b. times

c. 8 times

d. 16 times

3

( ) ( )3(5)3ag agFe OH Fe OH

Problem06What volume of measured at & 1 atm, is needed to burn

completely 1L of propane gas measured under the same conditions?

a. 5L

b. 10L

c. 7L

d. 6L

2(g)O

3 8C H

0 C

Problem07Equal volume of three acids solutions of pH 3, 4 & 5 are mixed in a vessel.

What will be the ion concentration in the mixture?

a.

b.

c.

d.

-33.7 x 10 M

-31.11 x 10 M

-41.11 x 10 M

-43.7 x 10 M

Problem08The relative reactivities of acyl compounds towards nucleophilic substitution

are in the order of

a. Acid anhydrite > Amide >Ester > Acyl chloride

b. Acyl chloride > Ester > Acid anhydrite > Amide

c. Acyl chloride > Acid anhydrite > Ester > Amide

d. Ester > Acyl chloride > Amide> Acid anhydrite

Problem09In DNA, the complimentary bases are

a. Adenine & Guanine; thymine & Cytosine

b. Uracil & Adenine; Cytosine & Guanine

c. Adenine & thymine; Guanine & Cytosine

d. Adenine & thymine; Guanine & Uracil

Problem10Base strength of

is in order of

a. (i)> (iii)> (ii)

b. (i)> (ii) > (iii)

c. (i)> (i)> (iii)

d. (iii)> (ii) > (i)

( )

23H CC H( )

2H C C H( )

H C C

Problem11Equimolar solution of the following were prepare in water separately. Which

one of the solution will record the highest pH?

a.

b.

c.

d.

2MgCl

2CaCl

2SrCl

2BaCl

Problem12The sequence of ionic mobility in aqueous solution is

a.

b.

c.

d.

+ + + +Rb > K > Cs > Na

+ + + +Na > K > Rb > Cs

+ + + +K > Na > Rb > Cs

+ + + +Cs > Rb > K > Na

Problem13If uncertainty in position & momentum are equal, then uncertainty in velocity

is

a.

b.

c.

d.

1 h

m

h

1

2

h

m

2

h

Problem14How many stereoisomer’s does this molecule have?

CH3CH=CHCH2CHBrCH3

a. 8

b. 2

c. 4

d. 6

Problem15On the basis of the following values, the shortest oxidizing agent is

a.

b.

c.

d.

4 31 0

6 6Fe CN Fe CN ;E 0.35e V

2+ 3+ -1 0Fe Fe + e ; E = -0.77V

3+Fe

3

6Fe CN

4

6Fe CN

2+Fe

Problem16The correct order of decreasing second ionization enthalpy of Ti (22), V (23), Cr

(24) & Mn (25) is

a. Mn > Cr> Ti>V

b. Ti > V > Cr > Mn

c. Cr > Mn > V > Ti

d. V > Mn > Cr > Ti

Problem17Which one of the following is most reactive towards electrophilic attack ?

a.

b.

c.

d.

Problem18Four diatomic species are listed below in different sequences. Which of

these presence the correct order of there increasing bond order?

a.

b.

c.

d.

2- + -

2 2 2C < He < NO < O

+ - 2-

2 2 2He < O < NO < C

- 2- +

2 2 2O < NO < C < He

2- - +

2 2 2NO < C < O < He

Problem19How many moles of lead (II) chloride will be formed from a reaction between

6.5g of PbO & 3.2b HCl ?

a. 0.011

b. 0.029

c. 0.044

d. 0.333

Problem20The stability of carbanions in the followings is in the order of

(i) RC = C

(ii) R2C = CH

(iii)

(iv) R3C - CH2

a. (iv)> (ii)>(iii)>(i)

b. >(iii) > (ii)> (iv)

c. > (ii)> (iii) >(iv)

d. (ii)> (iii) >(iv)> (i)

Problem21Acetophenone when reacted with a base, , yields stable compound

which has the structure

a.

b.

c.

d.

2 5C H ONa

Problem22Volume occupied by 1 molecule of water (density= 1g ) is

a.

b.

c.

d.

-23 33.0 x 10 cm

-23 35.5 x 10 cm

-23 39.0 x 10 cm

-23 36.023 x 10 cm

Problem23Bond dissociation enthalpy of are 434,242 & 431 respectably.

Enthalpy of formation HCl is

a.

b.

c.

d.

2 2H , Cl & HCl

-193 kJ mol

-1245 kJ mol

-193 kJ mol

-1245 kJ mol

Problem24Which of the following complexes exhibits the highest paramagnetic behavior

?

a.

b.

c.

d.

2 2Co ox OH

3

3 6Ti NH

+

32 2 2V glv OH NH

2+2

3Fe en bpy NH

Problem25Which one of the following statement is not true?

a. Buna-S is a copolymer of butadiene & styrene.

b. Natural rubber is a 1, 4-polymer of isoprene.

c. In vulcanization, the formation of sulphur bridges between different chains

make rubber harder & stronger.

d. Natural rubber has the trans-configuration at every double bond.

Problem26In a reaction of aniline a coloured product C was obtained

The structure of C would be

a.

b.

c.

d.

Problem27Which of the following condition are correct?

a.

b.

c.

d.

H < 0 & S < 0

H > 0 & S < 0

H = 0 & S < 0

H > 0 & S > 0

Problem28The measurement of the electron position is associated with an uncertainty in

momentum, which is equal to . The uncertainty in electron

velocity is (mass of an electron is ).

a.

b.

c.

d.

-289 x 10 g

-18 -11 x 10 g cm s

5 -110 cmsX

11 -110 cmsX

9 -110 cmsX

6 -11 10 cmsX

Problem29The angular shape of ozone molecule consists of

a.

b.

c.

d.

1 & 1n bond

2 & 1n bond

1 & 2n bond

2 & 2n bond

Problem30Percentage of free space in a body centered cubic units cell is

a. 34%

b. 28%

c. 30%

d. 32%

Problem31The value of equilibrium constant of the reaction

Is 8.0. the equilibrium constant of the reaction will be

a. 16

b. 1/8

c. 1/16

d. 1/64

( ) 2( ) 2( )

1 1

2 2g g gHI H I

( ) 2( ) ( )2g g gHI I HI

Problem32The values of Kp1 & Kp2 for the reaction

Are in the ratio 9:1. If degree of dissociation of X & A be equal, the total

pressure at equilibrium (i) & (ii) are in the ratio

a. 36:1

b. 1:1

c. 3:1

d. 1:9

...( )X Y Z i 2 ...( )A B ii

Problem33Are in the ratio 9:1. If degree of dissociation of X & A be equal, the total

pressure at equilibrium (i) & (ii) are in the ratio

a. 36:1

b. 1:1

c. 3:1

d. 1:9

Problem34Which of the following is an amine hormone?

a. Insulin

b. Progesterone

c. Thyroxine

d. Oxypurin

Problem35Kohilrausch’s laws states that at

a. Infinity dilution, each ion makes definite contribution to

conductance of an electrolyte what ever be the nature of the other

ion of the electrolyte.

b. Infinity dilution, each ion makes definite contribution to equivalent

conductance of an electrolyte what ever be the nature of the other

ion of the electrolyte.

c. Finite dilution, each ion makes definite contribution to equivalent

conductance of an electrolyte what ever be the nature of the other

ion of the electrolyte.

d. Infinity dilution, each ion makes definite contribution to equivalent

conductance of an electrolyte depending on the nature of the other

ion of the electrolyte.

Problem36Green chemistry means such reaction which

a. Are related to the depletion of ozone layer

b. Study the reaction in plants

c. Produce colour during reactions

d. Reduce the use and production of hazardous chemicals

Problem37Which of the following question is not correct?

a. The number of carbon atoms in a unit cell of diamond is 4.

b. The number of bravais lattics in which a crystal can be categorize is 14

c. The fraction of the total volume occupied by the atoms in a primitive

cell is 0.48

d. Molecular solids are generally volatile.

Problem38In a substitution reaction of the type

Which one of the following has the highest relative rate?

a.

b.

c.

d.

DMFR B Cl R Cl Br

3

3

CH

CH C 2

3

CH Br

CH

3 2CH CH Br

2 2 2CH CH CH Br

3 2

3

CH CH - CH Br

CH

Problem39The correct order of increasing bond angle in the following triatomic species is

a.

b.

c.

d.

+ -

2 2 2NO < NO < NO

+ -

2 2 2NO < NO < NO

- +

2 2 2 NO < NO < NO

- +

2 2 2NO < NO < NO

Problem40With which one of the following elements silicon should be doped so as to

give p-type of semiconductor ?

a. Selenium

b. Boron

c. Germanium

d. Arsenic

Problem41

A (predominantly) is

a.

b.

c.

d.

3 2

3

H C CH CH CH HBr A

CH

3 3

3

CH CH CH CH

Br CH

3 3

3

CH CH CH CH

CH Br

3 2 2

3

CH CH CH CH Br

CH

3 2 3

3

Br

CH C CH CH

CH

Problem42An organic compound contains C, H & O. its elemental analysis gave C,

38.71% & H, 9.67%. The empirical formula of the compound would be

a.CHO

b.

c.

d.

4CH O

3CH O

2CH O

Problem43In which of the following coordination entities the magnitude of

(CFSE is octahedral field) will be maximum?

a.

b.

c.

d.

0

3

6Co CN

3

2 4 3Co C O

3

2 6Co H O

3

3 6Co NH

Problem44The alkali metals from salt-like hydrides by the direct synthesis at elevated

temperature. The thermal stability of these hydrides decreases in which of

the following orders?

a. NaH > LiH >KH > RbH > CsH

b. LiH > NaH > KH > RbH > CsH

c. CsH > RbH > KH > NaH > LiH

d. KH > NaH > LiH > CsH > RbH

Problem45Which of the following are not state function?

(i)q+w (ii)q (iii)w (iv)H-TS

a. i), (ii) & (iii)

b. & (iii)

c. & (vi)

d. (ii), (iii) & (vi)

Problem46In the hydrocarbon,

The state of hybridization of carbon 1, 3 & 5 are in the following

sequence

a.

b.

c.

d.

3 25 4 2 136

CH CH CH CH C CH

2 3Sp, Sp , Sp

3 2Sp , Sp , Sp

2 3Sp , Sp, Sp

3 2Sp, Sp , Sp

Problem47Number of moles of required to oxidize one mole of ferrous oxalate

completely in acidic medium will be

a. 7.5moles

b. 0.2 moles

c. 0.6 moles

d. 0.4 moles

Problem48The rate constants for two different reactions are ,

respectively. The temperature at which is

a. 2000 K

b. 1000/2.303K

c. 1000K

d. 2000/2.303K

1 2k & k 16 -2000/T 15 -1000/T10 . e & 10 . e

Problem49A strong base can abstract an α-hydrogen from

a. Keton

b. Alkane

c. Alkene

d. Amine

Problem50Standard free energies of formation (in kJ/mol) at 298K are -237.2, -394.4 & -8.2

for respectively. The value of for the

pentane – oxygen fuel cell is

a. 1.0968 V

b. 0.0968V

c. 1.968V

d. 2.0968V

2 (i) 2(g) (g)H O , CO & pentane 0

cellE

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