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VIT – PAST PAPERS
CHEMISTRY - UNSOLVED PAPER - 2009
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
01Given that , express the H-H bond energy in
kcal/mol. ,
a. 52.15
b. 911
c. 104
d. 52153
Problem
fH H 218 kJ / mol
02Identify the alkyne in the following sequence of reactions
a.
b.
c.
d.
Problem
2H OzonolysisLindlar 's catalyst only
Wacker2 2Process
Alkyne A B
CH CH
3 3H C C C CH
3 2H C CH C CH
2H C CH C CH
2HC C CH C CH
Problem03Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond
angle in the molecule of A is
a.
b.
c.
d.
104 40'
103
107
109 28'
Problem04One mole of alkene on ozonolysis gave one mole of acetaldehyde and one mole
of acetone. The IUPAC name of is
a. 2-methyl-2-butene
b. 2-methyl-1-butene
c. 2-butene
d. 1-butene
Problem05The number of 'pi' bonds present in molecules,
respectively are
a. 3, 4
b. 4, 2
c. 2, 3
d. 3, 2
p d 3 4XeO and XeO
Problem06The wavelengths of electron waves in two orbits is 3: 5. The ratio of kinetic energy
of electrons will be
a. 25: 9
b. 5: 3
c. 9: 25
d. 3: 5
Problem07Which one of the following sets correctly represents the increase in the
paramagnetic property of the ions?
a.
b.
c.
d.
2 2 2 2Cu V Cr Mn
2 2 2 2Cu Cr V Mn
2 2 2 2+Cu V Cr Mn
2 2 2 2V Cu Cr Mn
Problem08Electrons with, a kinetic energy of are evolved from the
surface of a metal, when it is exposed to radiation of wavelength of 600 nm. The
minimum amount of energy required to remove an electron from the metal atom
is
a.
b.
c.
d.
46.023 x 10 J / mol
192.3125 x 10 J
-193 x 10 J
196.02 x 10 J
346.62 x 10 J
Problem09The chemical entities present in thermosphere of the atmosphere are
a.
b.
c.
d.
2O ,O , NO
3O
2 2 2 2N , O , CO , H O
3 2 2O , O , O
Problem10The type of bonds present in sulphuric anhydride are
a.
b.
c.
d.
3 and three P d
3 ,one p p and two P d
2 and three p d
2 and two P d
Problem11In Waterman reaction,a diazonium group is replaced by are
a. Cu/HCl
b.
c.
d.
X using Y. X and Y
X Y
Cl
Cl
2CuCl / HClCl
2CuCl / HCl2Cl
2Cu O / HCl
Problem12Which pair of oxyacids of phosphorus contains, ‘P – H’ bonds?
a.
b.
c.
d.
3 4 3 3H PO , H PO
3 5 4 2 7H PO , H P O
3 3 3 2H PO , H PO
3 2 3H PO , HPO
Problem13Dipole moment of HCl = 1.03 D, HI == 0.38 D. Bond length of
. The ratio of fraction of electric charge ,
existing on each atom in HCl and HI is
a. 12:1
b. 2.7:1
c. 3.3: 1
d. 1: 3.3
HCl 1.3 A and HI 1.6 A
Problem14 on hydrolysis forms 'X' and HCl. Compound 'X' loses water at and
gives 'Y'. Compounds 'X' and 'Y' respectively are
a.
b.
c.
d.
4SiCl 1000 C
2 6 2H SiCl ,SiO
4 4H SiO , Si
2SiO , Si
4 4 2H SiO , SiO
Problem151.5 g of was found to contain 0.9 g of Cd. Calculate the atomic weight
of Cd.
a. 118
b. 112
c. 106.5
d. 53.25
2CdCl
Problem16Aluminums reacts with Noah and forms compound 'X'. If the coordination
number of aluminum in' X' is 6, the correct formula of X is
a.
b.
c.
d.
2 4 2Al H O OH
2 3 3Al H O OH
2 2 4Al H O OH
2 6 3Al H O OH
Problem17The average kinetic energy of one molecule of an ideal gas at and 1
atm pressure is
a.
b.
c.
d.
27 C
1 1900 cal K mol
21 1 16.21 x 10 JK molecule
1 1336.7 JK molecule
1 13741.3JK mol
Problem18Assertion (A) K, Rb and Cs form superoxides.Reason (R) The stability of the
superoxides increases from 'K' to 'Cs' due to decrease in lattice energy.The
correct answer is
a. Both (A) and (R) are true and (R) is the correct explanation of (A)
b. Both (A) and (R) are true but (R) is not the correct explanation of (A)
c. (A) is true but (R) is not true
d. (A) is not true but (R) is true
Problem19How many 'mL' of perhydrol is required to produce sufficient oxygen which can
be used to completely convert 2 L of gas?
a. 10 mL
b. 5 mL
c. 20 mL
d. 30mL
2 3SO gas to SO
Problem20pH of a buffer solution decreases by 0.02 units when 0.12g of acetic acid is
added to 250 mL of a buffer solution of acetic acid and potassium acetate at .
The buffer capacity of the solution is.
a. 0.1
b. 10
c. 1
d. 0.4
27 C
Problem21Match the following
(A) Flespar (I)
(B) Asbestos (II)
(C) Pyrargyrite (III)
(D) Diaspore (IV)
(V)
The correct answer is
(A) (B) (C) (D)
a. (a) IV V II I
b. (b) IV V I II
c. (c) IV I III II
d. (d) II V IV I
3 3Ag SbS
2 3 2Al O .H O
4 2MgSO .H O
3 8KAlSi O
3 3 4CaMg SiO
Problem22Which one of the following order is correct for the first ionisation energies of the
elements?
a. B <Be <N <O
b. Be <B <N <O
c. B <Be <O <N
d. B <O <Be <N
Problem23What are in the following reaction sequence?
a.
b.
c.
d.
X and Y
2 2Cl Cl2 5C H OH X Y
2 5 3C H Cl,CH CHO
3 3 2CH CHO, CH CO H
3 3CH CHO,CCl CHO
2 5 3C H Cl,CCl CHO
Problem24What are in the following reactions?
(i)
(ii)
(iii)
a.
b.
c.
d.
A,B,C
3 2 2CH CO Ca A
HI3 2 Red PCH CO H B
4 10P O3 22CH CO H C
A B C
2 6C H 3 3CH COCH 3 2CH CO O
3 2CH CO O 2 6C H 3 3CH COCH
3 3CH COCH 2 6C H 3 2CH CO O
3 3CH COCH 3 2CH CO O 2 6C H
Problem25One per cent composition of an organic compound A is, carbon: 85.71% and
hydrogen 14.29%. Its vapour density is 14. Consider the following reaction
sequence
Identify
a.
b.
c.
d.
2 2
3
Cl /H O (i)KCN/EtOH
(ii)H O A B C
C
3 2CH CH CO H
|
OH
2 2 2HO CH CH CO H
2 2HO CH CO H
3 2 2CH CH CO H
Problem26How many tripeptides can be prepared by linking the amino acids glycine, alanine
and phenyl alanine?
a. One
b. Three
c. Six
d. Twelve
Problem27A codon has a sequence of and specifies a particular B that is to be
incorporated into a . What are ?
a. 3 bases amino acid carbohydrate
b. 3 acids carbohydrate protein
c. 3 bases protein amino acid
d. 3 bases amino acid protein
A B C
A,B,C
A
C
Problem28Parkinson's disease is linked to abnormalities in the levels of dopamine in the
body. The structure of dopamine is
a.
b.
c.
d.
Problem29During the depression in freezing point experiment, an equilibrium is' established
between the molecules of
a. liquid solvent and solid solvent
b. liquid solute and solid solvent
c. liquid solute and solid solute
d. liquid solvent and solid solute
Problem30Consider the following reaction,
Which one of the following statements is true for ?
(I) It gives prop ionic acid on hydrolysis
(II) It has an ester functional group
(III) It has a nitrogen linked to ethyl carbon
(IV) It has a cyanide group
a. IV
b. III
c. II
d. I
2EtOH/H O2 5C H Cl AgCN X major
X
Problem31For the following cell reaction,
of the cell is
a. -0.60 V
b. 0.60 V
c. 6.0 V
d. None of these
2Ag Ag AgCl Cl Cl ,Pt
fG AgCl 109 kJ / mol
fG Cl 129 kJ / mol
fG Ag 78 kJ / mol
E
Problem32The. synthesis of crotonaldehyde from acetaldehyde is an example of reaction.
a. nucleophilic addition
b. elimination
c. electrophilic addition
d. nucleophilic addition-elimination
Problem33At , the molar conductance's at infinite dilution for the strong electrolytes
NaOH, NaCl and are
respectively, in
is
a.
b.
c.
d.
25 C
2BaCl
4 4 4 2 1248 x 10 , 126 x 10 and,280 x 10 Sm mol m 2Ba OH
2 1Sm mol
452.4 x 10
4524 x 10
-4402 x 10
-4262 x 10
Problem34The cubic unit cell of a metal has an edge length of 362 pm. Its density is . The
type of unit cell is
a. primitive
b. face centred
c. body centred
d. end centred
Problem35The equilibrium constant for the given reaction is 100.
What is the equilibrium constant for the reaction given below?
a. 10
b. 1
c. 0.1
d. 0.01
2 2 2N g 2O g 2NO g
2 2 2
1NO g N g O g
2
Problem36For a first order reaction at , the ratio of time required for 75%
completion to 25% completion of reaction is
a. 3.0
b. 2.303
c. 4.8
d. 0.477
27 C
Problem37The concentration of an organic compound in chloroform is 6.15 g per 100 mL of
solution. A portion of this solution in a 5 cm polar meter tube causes an observed
rotation of . What is the specific rotation of the compound?
a.
b.
c.
d.
1.2
12
3.9
39
61.5
Problem3820 mLof 0.1 M acetic acid is mixed with 50 mL of potassium acetate
. Calculate concentration of
potassium acetate if pH of the mixture is 4.8.
a. 0.1 M
b. 0.04 M
c. 0.4 M
d. 0.02 M
5aK of acetic acid 1.8 x 10 , at 27 C
Problem39Calculate for the reaction,
given the following :
(A)
(B)
(C)
a. +823 kJ
b. -581 kJ
c. -435 kJ
d. +531 kJ
2 3 2 4Na O s SO g Na SO g
2 2
1Na s H O l NaOH s H g 146 kJ
2
2 4 2 3Na SO S H O l 2NaOH s SO g 418 kJ
2 2 22Na O s 2H g 4Na s 2H O l 259 kJ
Problem40Which one of the following is most effective in causing the coagulation of an
sol?
a. KCl
b.
c.
d.
2 3As S
3AlCl
4MgSO
3 6K Fe CN
