2005-CH
2005- CH
Test Paper Code: CH
Time: 3 Hours
Max. Marks: 300
READ THE INSTRUCTIONS ON THE
LEFT SIDE OF THIS PAGE CAREFULLY
INSTRUCTIONS
1. The
question-cum-answer
book
has
32 pages and has 44 questions. Please
ensure that the copy of the question-cumanswer book you have received contains all
the questions.
2. Write your Roll Number, Name and the
name of the Test Centre in the
appropriate space provided on the right side.
3. Write the answers to the obj ective
questions against each Question No. in the
Answer Table for Objective Questions,
provided on page No. 11. Do not write
anything else on this page.
4. Each objective question has 4 choices for its
answer: (A), (B), (e) and (D). Only ONE of
them is the correct answer. There will be
negative marking for wrong answers to
objective questions. The following marking
scheme for objective questions shall be used:
(a) For each objective question, you will
be awarded 3 (three) marks if you
have written only the correct answer.
(b) In case you have not written any answer
for a question you will be awarded
o (zero) markJor that question.
(c) In all other cases, you will be awarded
-1 (minus one) mark for the question.
5. Answer the subjective question only in the
space provided after each question.
6. Do not write more than one answer for the
same question. In case you attempt a
subjective question more than once, please
cancel the answer(s) you consider wrong.
Otherwise, the answer appearing later only
will be evaluated.
7. All answers must be written in blue!
blacklblue-black ink only. Sketch pen, pencil
or ink of any other colour should not be used.
8. All rough work should be done in the space
provided and scored out finally.
9. No supplementary sheets will be provided
to the candidates.
1O.Logarithmic Tables I Calculator of any
kind I cellular phone I pager I electronic
gadgets are not allowed.
11.The question-cum-answer book must be
returned in its entirety to the Invigilator
before leaving the examination hall. Do not
remove any page from this book.
ROLL NUMBER
Name:
Test Centre:
Do not write your Roll Number or
Name anywhere else in this questioncum-answer book.
I have read all the instructions and shall
abide by t h em.
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TRAJECTORY EDUCATION
NOTE: Attempt ALL the 44 questions. Questions 1 - 30 (objective questions) carry
three marks each and questions 31 - 44 (subjective questions) carry
fifteen marks each.
Write the answers to the objective questions ONLY in the Answer Table for
Objective Questions provided on page 11.
1.
2.
Arrange the following in the decreasing order of acidity of the hydrogen indicated in italics.
(i)
CH 3 COCH 3
(A)
(ii) > (iii) > (i) > (iv)
(B)
(iv) > (ii) > (iii) > (i)
(C)
(iv) > (iii) > (ii) > (i)
(D)
(ii) > (iv) > (iii) > (i)
For the reaction sh own below if the concentration of KCN is increased four tim es, the r ate
of the reaction will be
rL~e
G-r-'\:
CI
Me
(A)
doubled
(B)
increased four times
(C)
unaffected
(D)
halved
ag. MeOH
+ KCN
•
~_~e
G-r
- '\: CN
+ KCI
Me
TRAJECTORY EDUCATION
3.
Benzyl chloride is reacted with different nucleophiles shown below. Arrange them in the
decreasing order of reactivity.
e
e
e
e
Nucleophiles : HO, CH3COO, PhO, CH 30
(A)
5.
e
e
e
e
> HO > PhO > CH 3COO
(C)
e
e
e
HOe > CH 30 > PhO > CH 3COO
e
e
e
e
HO > PhO > CH 30 > CH 3 COO
(D)
CH 3COO
(B)
4.
CH 30
e
8
> CHaO
e
> HO
8
> PhO
The rate of nitration of the following aromatic compounds decreases in the order
(i)
benzene
(ii)
pyridine
(iii)
thiophene
(iv)
toluen e
(A)
(iv) > (i) > (iii) > (ii)
(B)
(iii) > (iv) > (i) > (ii)
(C)
(iii) > (ii) > (i) > (iv)
(D)
(ii) > (i) > (iv) > (iii)
The major product formed in the reaction of 1,3-butadiene with bromine is
(C)
CH2=C(Br)-C(Br)=CH2
TRAJECTORY EDUCATION
6.
The r eaction of (+ ) 2-iodobutane and NaI' 0 ' is radioactive isotope of iodine) in acetone
was studied by m ea suring the rat e of r acemization (k , ) an d t h e rate of incorporation
•
For this r eaction, the relationship between k , and k ; is
(A)
k ; = 2 x k,
(B)
k ; = (1/ 2) Xk,
(e)
k; = k,
(D)
k ; = (1/3 ) x k,
DNA
1
7.
Ba(OH)2
•
(P)
MgO/ 1'..
P04 3 - + (Q)
Hel .-
(R) + (S) + sugar
In t h e scheme shown above (P), (Q ), (R) and (S) a r e
(A )
(P ) = purine bases, (Q ) pyrimidine bases, (R) = nucJeotides , (S) = nucleosides
(B )
(P ) = (Q ) = n u cleotides, (R) = pyrimidine bases, (S) = purin e bases
(e)
(P) = nucleosides, (Q ) = nucleotides , (R) = (S) = purine bases
(D )
(P ) = nucleotides, CQ) = nucleosides, (R ) = pyrimidin e bases , (S) = purine bases
TRAJECTORY EDUCATION
8.
The products obtained from the following reaction are
(A)
A
°
Ph
+ezHsOH
A
°
(B )
Ph
OH
+e,Hs OH
IBOH
°
(e)
A
(D)
Ph
9.
+e zH s'8 oH
IBO H
The product(s) obtained in the following reaction is (are)
o~
D
•
OH
(A)
+
HO~
(B)
OH
(e)
OH
(D)
OH
~
+
TRAJECTORY EDUCATION
10.
Match the isoelectric points with the amino acids
Isoelectri c point
Amin o acid
1l.
12.
(X)
H 2 NCH 2 COOH
(D
9.5
(Y)
HOOCCH 2 CH 2 CH(NH 2 )COOH
(II)
6.0
(Z)
H ,N(CH 2 ), CH(NH, )COOH
(III)
3.1
(A)
(X ) - (II) ,
(Y ) -
(B)
(X ) - (III),
(Y ) - (1),
(Z) - (II)
(C)
(X ) - (1),
(Y ) -
(II) ,
(Z ) - (III)
(D)
(X) - (lI),
(Y) -
(1),
(Z) - (III)
(Ill),
(Z) - (1)
Th e compound h aving the h ighest m elting point is
(A )
LiCI
(B )
LiF
(C)
LiI
(D )
LiBr
The shape of SF, is
(A)
t etrahedral
(B )
trigonal bipyramidal
(C)
square pla n a r
(D)
oct ahedr a l
TRAJECTORY EDUCATION
13.
14.
15.
The degree of h ydra tion is expected to be m aximum for
(A )
Mg2+
(B )
Na+
(C)
Ba 2 +
(D )
K+
The decreasing order of the first ionization ener gy of the following elem ents is
(A)
Xe > Be > As > AI
(B)
Xe > As > Al > Be
(C)
Xe > As > Be > Al
(D)
Xe > Be > AI > As
The radioactive isotope u sed to loca t e br a in tumors is
(A)
(B )
(C)
131 I
53
(D)
16.
The crystal field st a bilization en ergy of high spin d 7 octah edr al complex is
(A)
--54 "'0 +2P
(B)
-4
-"'0
+3P
5
(C)
--59 "'0 + 2P
(D)
- 9
-"'0
+ 3P
5
TRAJECTORY EDUCATION
17.
18.
19.
The complex with the most intense colour among the following is
f-
(B )
[MnCI,
(C)
[CoCI, J2 -
(D)
[CoFs
J3-
On addition of a solution of AgN0 3 to a solution of Na 2S 20 3 , it turns black on standing
due to the formation of
(A)
Ag
(D)
Ag 2 SO,
Among the following complexes,
(i)
[Ru(bipyridyJ) 3 J+
(ii)
[Cr(EDTA)r
(iii)
trans-[CrCI 2 (oxalate)2)'-
the ones that show chirality are
(A)
(i), (ii), (iv)
(B )
(i), (ii), (iii)
(C)
(ii), (iii), (iv)
(D)
(i), (iii), (iv)
TRAJECTORY EDUCATION
20.
The electronic configurations that have orbital angular momentum contribution
octahedral environment are
(A)
21.
22.
(B)
d j and high spin d 4
j
d and d 2
(C)
d 2 and high spin d 6
(D)
high spin d 4 and high spin d 6
For an ideal solution formed by mixing of pure liquids A and B
(A)
6.Hmixing = 0
(B)
6.H mixing
<0
(C)
6.H mixing
>0
(D)
6.SmiXing
=
0
The relationship between the equilibrium constant K j for the reaction:
and the equilibrium constant K, for the reaction:
2CO(g) + 0 2(g) ",,,~~'-,;,,, 2C0 2 (g) is
23.
(A)
2K j = K2
(B)
Kj =K2
(C)
Kj = K2
(D)
Kj =K2
2
2
For H-like atoms, the ground state energy is proportional to
j.J.
(A)
Z2
Z2
(B)
j.J.
(C)
j.J.Z2
(D )
where
1
f1 Z2
f.1.
is the reduced mass and Z is the nuclear charge.
TRAJECTORY EDUCATION
111
an
24.
Th e value of th e int egral
(A )
f e - x dx is
x
2
x 2 e- x + 2xe- x + 2e - x
(B)
(e)
CD)
25.
_ x 2 e - x - 2xe - x - 2e - x
For the reaction aA
~ products , the
plot of _1_ versus time (t) gives a straight line. Th e
[Al
order of the r eaction is
26.
27.
(A )
0
(B )
1
(e )
2
(D )
3
The pH of a s olution prepared from 0.005 mole of Ba(OH)2 in 100 cc water is
CA)
10
(B )
12
(e )
11
(D )
13
For a n electron whose x-positional uncertainty is 1 x 10- 10 m ,
the uncer t ainty in the
1
x-component of the velocity in ms- will be of the order of
(Data: m , = 9 x 10-31 kg, h = 6.6 X 10-34 Js)
CA)
10 6
(B)
10 9
(e)
10 12
(D )
10 15
TRAJECTORY EDUCATION
28.
For the following system in equilibrium
eae0 3 (s) ",,~~'-';'" eaO(s) + e0 2 (g)
the number of components (e), phases (P) and degrees of freedom (F), respectively, are
29.
(A)
2,2 , 2
(B)
1, 3, 0
(e)
3, 3, 2
(D)
2, 3, 1
For the distribution of molecular velocities of gases, identify the correct order from the
following (where v onp ' v ov and v"''' are the most probable velocity, average velocity and
root mean square velocity, respectively) :
30.
(A)
v rms >
Vav
>
V mp
(B)
v mp >
V rms
>
Vav
(C)
Vav>Vmls>Vmp
CD)
v mp >
Vav
Given that EOh
(A)
1.21 V
(B)
0.33 V
(e)
-0.036 V
(D)
0.036 V
>
2+
V nns
Ih
= -0.44V and EOh
3+
Ih
2+
=0.77V, the EOh
3+
Ih
is
Space for rough work
TRAJECTORY EDUCATION
31.
Identify the major product(s) formed in the following reactions. Intermediates and
reaction mechanisms need not be discussed.
o
(a)
&Me
1. NH2 0H.HCl
,
Me
Ct (0
CHO
(b)
(c)
I
NaOEt
+
a
CHO
(6)
(6)
Me
fY<0
- o-{ }-Me
TRAJECTORY EDUCATION
(3)
32.
How may the following transformations be effected?
Indicate the r eagents / reaction
conditions clearly in each step.
(a)
(not involving any functional group t r a nsformation of the COOH group in the starting
(6)
material)
<)-COOH~--
Br
B r - Q -COOH
Br
(b)
(c)
(u sing diethyl malonate as the only source of carbon)
(3)
<>
(6)
HO-\ )-NH2
TRAJECTORY EDUCATION
33.
Suggest a suitable mechanism for each of the following reactions.
(a)
PhCOCH 2 CH 3 + Ph-C",C-COOEt
~OH
(b)
ttJ
HCl
NaOEt
~
EtOH
Xl
Me
Ph
I"':
0
(6)
0
~Cl
ltJ
TRAJECTORY EDUCATION
(9)
34.
Rationalize the following observations u sing suitable mechanisms.
(3)
(a )
Nitration of 4-t-butyltoluene gives 4-nitrotoluene as one of the products.
(b)
cis-4-t-Butylcyclohexyltrimethylammonium hydroxide undergoes Hoffman elimination
to yield 4-t-butylcyclohexene whereas the trans isomer does not (use conformations to
(6)
explain).
(c)
PhMgBr + 2PhCHO
1. dry ether
) PhCOPh + PhCH 2 0H
2. acidic workup
TRAJECTORY EDUCATION
(6)
35.
(a)
S uggest
a
chemical
meth od
for
th e
separation
of a
mixture
containing
p-N,N-dimethylaminophenol and p -aminoben zoic acid and give a confirmatory test
(b)
for phenol.
(6)
Wri te the structures of X, Y and Z in the follow ing.
(9)
(i )
~
o-
NH2 l. NaN0 2 / di l. HC I, ? °C
2. p- Il aphthol / NaOH
(ii)
<7-
NHMe
(iii)
<7-
2
NMe2 NaN0 / dil.
NaN0 2 / dil. HCI
H~ I
X
Y
Z
TRAJECTORY EDUCATION
36.
(a)
Predict the h ybridization and draw the s tructure of the following mol ecules based on
VSEPR theory: (i) 13
(b)
(ii)
sot
(iii) P (CR 3 )3 F z
Explain why PC1 5 exists and PR 5 does not.
TRAJECTORY EDUCATION
(9)
(6)
37.
(a)
Write balanced equation s for the formation of
(i )
(b)
4-
P, 0 7
(6)
3-
fr om PO ,
Which one of th e two solutions has lower pH? Justify your an swer.
(i)
0. 1 M Fe(ClO,), or 0.1 M Fe(ClO')3
(ii)
0.1 M Hg(N03 )2 or 0 .1 M Zn (NO),
TRAJECTORY EDUCATION
(9)
38.
(a)
2+
Between CU(H,O)6
2+
and CO(H , O)6 ,which one has m ore di storted structure and
(6)
why?
(b)
Calculate CFSE (in units of ""0) and spin only m agnetic moment for the following
complexes:
(;)
[CoF6 ]
3~
(ii)
3-
[Fe(CN)6 ] .
(iii)
[NiCI 4 ]
TRAJECTORY EDUCATION
,-
(9)
39.
(a)
The radioactive element Ra ( Z = 88) emi ts th ree alpha particles in s uccession .
(6)
Deduce in which group the r esulting element will be found ?
(b)
A r a dioisotope sample h as an in itial activity of 23 dis/min. After
t
h , the activity is
11.5 dis/min. How many a t oms of the radioactive nuclide wer e presen t origin ally?
[at'/2 = 0.69]
(9)
TRAJECTORY EDUCATION
40.
(a)
(b)
Write the products of the following r eactions:
(i)
CH 31 + HO-
(iii)
2CF31 + Na [Mn (CO)5J
(9)
Arrange BF3 , BC1 3 and BBr3 in the increasing order of Lewis acidity and justify. (6)
TRAJECTORY EDUCATION
41.
Justify the following:
(a)
(15)
Considering CO, as an ideal gas, equipartition theorem predicts its total energy
as 6.5 kT.
(b)
!J. S
for a process is the same whether the process takes place reversibly or
irreversibly.
(c)
The quantity !J.G equals the maximum non-expansion work done by a system in a
constant temperature-pressure process.
TRAJECTORY EDUCATION
Cd)
At constant temperature and pressure, L'> G = 0 for a reversible phase change.
Ce)
Transition states cannot be isolated as independent chemical species.
TRAJECTORY EDUCATION
42.
The rate constan t k for a second order r eaction P + Q
IOglO k =20 -
3~0
-4
Products is expressed as
, wher e the concentration is in mol lit - 1 , T is in absolu te tem perature
and tim e is in minutes . The initial concentrations of both the reactants ar e 0.05 M.
1
Calculate the activation energy and h alf life of the reaction at 2TC. (R = 2 cal K - mol -
TRAJECTORY EDUCATION
1
).
(15)
43 .
The equilibrium constant for t h e reaction
Fe 3 0 , (s)+CO (g) __
'
3FeO (s)+C0 2 (g)
at 600°C is 1.00. If a mixture init ially consisting of 1 mole of Fe 3 0 , , 2 moles of CO, 0.5 mole
of FeO a nd 0.3 mole of CO 2 is h eated to 600°C at constant total pressure of 5 a tmospheres ,
how m an y moles of each subst ance would be present at equilibrium?
TRAJECTORY EDUCATION
(15)
44.
(a)
Use the time-independent Schrodinger equation to calculate the energy of a particle
'hV
ofM ass ""
m WIt
= O'm
h
testate
If!
=
g.
-3
a
sm -trx.
sm -try.
sm -trz.m a cu b'Icalb ox
a
a
a
oflength "a".
TRAJECTORY EDUCATION
(9)
(b)
At 20°C, the vapor pressure of two pure liquids X and Y which form an ideal solution
are 70 torr and 20 torr respectively. If the mole fraction of X in solution is 0.5, find
the mole fractions of X and Y in the vapor phase in equilibrium with the solution.
TRAJECTORY EDUCATION
(6)
TRAJECTORY EDUCATION