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General Instructions:
Read the following instructions
carefully.
a) There are 35 questions in this
question paper with internal choice.
b) SECTION A consists of 18
multiple-choice questions carrying 1 mark each.
c) SECTION B consists of 7 very
short answer questions carrying 2 marks each.
d) SECTION C consists of 5 short answer
questions carrying 3 marks each.
e) SECTION D consists of 2 case-
based questions carrying 4 marks each.
f) SECTION E consists of 3 long
answer questions carrying 5 marks each.
g) All questions are compulsory.
h) Use of log tables and
calculators is not allowed
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SECTION A ( MCQs)
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1.
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Which of the following compounds has
tetrahedral geometry?
(a) [Ni(CN)4]2-
(b) [Pd(CN)4]2-
(c [PdCl4]2-
(d) [NiCl4]2-
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1
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2.
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K2[Fe(CN)6] is a/an
(a) double salt
(b) complex salt
(c) acid
(d) base
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1
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3.
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The number of possible isomers for the
complex
|Co(C2O4)2 (NH3)2|
(a) 1
(b) 2
(c) 3
(d) 4
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1
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4.
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According to Werner’s theory of
coordination compounds
(a) Primary valency is ionisable
(b) Secondary valency is ionisable
(c) Primary and secondary valencies are
lonisable
(d) Neither primary nor secondary valency is
ionisable
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1
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5.
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The ligand N(CH2CH2NH2)3
is
(a) bidentate
(b) tridentate
(c) tetradentate
(d) pentadentate
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1
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6.
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Among the following which are ambidentate
ligands?
(i) SCN–
(ii) NO−3
(iii) NO−2
(iv) C2O2−4
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
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1
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7.
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Among the following ions which one has the highest
paramagnetism ?
(a)[Cr(H2O)6] 3+
(b) [Fe(H2O)6] 2+
(c) [Cu(H2O)6] 2+
(d) [Zn(H2O)6] 2+
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1
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8.
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The complex ion which has no d-electrons in
the central metal atom is
(a) [MnO4]–
(b) [Co(NH3)6]3-
(c) [Fe(CN)6]3-
(d) [Cr(H2O)6]3+
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1
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9.
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The correct IUPAC name of the coordination
compound K3|Fe(CN)5NO| is
(a) Potassium pentacyanonitrosylferrate (II)
(b) Potassium pentacyanonitroferrate (II)
(c) Potassium nitritopentacyanoferrate (IV)
(d) Potassium nitritepentacynanoiron (II)
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1
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10.
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Correct formulae of
tetraaminechloronitroplatinum (IV) sulphate can be written as
(a) [Pt(NH3)4 (ONO)
Cl]SO4
(b) [Pt(NH3)4Cl2NO2]2
(c) [Pt(NH3)4 (NO2)
Cl]SO4
(d) [PtCl(ONO)NH3(SO4)]
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1
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11.
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|Pt(NH3)4| |CuCl4|
and |Cu(NH3)4||PtCl4| are known as
(a) hybridization isomers.
(b) coordination isomers
(c) linkage isomers
(d) polymerization isomers
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1
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12.
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The name of the linkage isomer of |C0(NH3)5NO2|Cl2 will
be
(a) pentaammonotrocobalt (II) chloride
(b) pentaaminenitrochloridecobaltate (III)
(c) pentaamminenitritocobalt (III) chloride
(d) pentanitrosoamminechlorocobaltate(III)
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1
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13.
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Which of the following complex species is
not expected to exhibit optical isomerism?
(a) [Co(en) (NH3)2Cl2]+
(b) [Co(en)3]3+
(c)[Co(en)2Cl2]
(d) [Co(NH3)3Cl3]
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1
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14.
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EDTA is used for the estimation of
(a) Na+ and K+ ions
(b) Cl– and Br– ions
(c) Cu2+ and Cs+ ions
(d) Ca2+ and Mg2+ ions
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1
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(A) Both Assertion and Reason are correct
and Reason is the correct explanation for Assertion.
(B) Both Assertion and Reason are correct
but Reason is not the correct explanation for Assertion
(C) Assertion is correct but Reason is
incorrect
(D) Assertion is incorrect but Reason is
correct
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1
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15
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Assertion : [Ti(H2O)6]3+ is
coloured while [Sc(H2O)6]3+ is
colourless.
Reason : d-d transition is not possible in [Sc(H2O)6]3
as it has no unpaired electron.
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1
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16
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Assertion : [Fe(CN)6]3– is
weakly paramagnetic while [Fe(CN)6]4– is
diamagnetic.
Reason : [Fe(CN)6]3– has +3 oxidation state while
[Fe(CN)6]4– has +2 oxidation state.
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1
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17
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Assertion: Chelates are less stable than
ordinary coordination compounds.
Reason: Chelates can be formed by bidentate ligands.
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1
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18
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1.
Assertion : Linkage isomerism arises in coordination
compounds containing ambidentate ligand.
Reason : Ambidentate ligand has two different donor atoms donating
simultaneously.
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1
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SECTION : B
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19
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On the basis
of crystal field theory,write the electronic configuration for d4 ion if Δo
>P.Explain
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2
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20
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When a
coordination compound CrCl3.6H2O is mixed with AgNO3
,2 moles of AgCl are precipitated per mole of the compound. Write
structural formula & IUPAC name of the complex.
OR
Discuss the
nature of Bonding in metal carbonyls.
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2
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21
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What is meant
by stability of a coordination compound in solution? State the factors
which govern stability of complexes.
Or
Giving a suitable
example for each, explain the following :
(i) Linkage isomerism
(ii) Ambidentate ligand
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2
1+1
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22.
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The formula
Co(NH3) 5CO3Cl could represent a carbonate
or chloride. Write structures and names of possible isomers.
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2
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23.
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[Co
(NH3)6] +3 is an inner orbital complex whereas [Ni(NH3)6] +2 is an outer
complex.
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2
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24.
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What is
crystal field splitting energy? What are the various factors affecting
CFSE.
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2
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25.
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What is
spectrochemical series? Explain the difference between a weak field ligand
and a strong field ligand.
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2
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SECTION :C
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26
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a.Which complex
ion is formed when undecomposed AgBr is washed with hypo solution in
photography?Give reaction.
b. Why
only transition metals are known to form pi complexes?
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1+2
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27
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A
complex is prepared by mixing CoCl2 and NH3 In the molar ratio of 1:4, 0.1M
solution of this complex was found to freeze at -0.372°c. what is the
formula of the complex ? Given that molal depression constant of water
(kf)=1.86c/m
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3
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28.
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a.Calculate
the over all complex dissociation equilibrium constant for the[ cu(NH3)4]2+
ion , given that β for this complex is 2.1 x(10)13?
b.
Predict the number of unpaired electrons in the square planar [Pt(CN)4]
2- ion.
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2+1
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29.
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a. CuSO4.5H2O
is blue in colour while CuSO4 is colouress. Why ?
b.
Magnetic moment of [MnCl4] 2- is 5.92BM. Explain giving reason .
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2+1
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30
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a.Explain
Coordination isomerism with example.
b. Write
down the applications of coordination compound
Or
a) Describe the
shape and magnetic behaviour of following complexes :
(i) [CO(NH3)6]3+
(ii) [Ni(CN)4]2- (At. No. Co = 27, Ni = 28)
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1+2
1.5+1.5
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SECTION :D
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31
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Read the
given passage and answer the questions that follows. Negative ion or
Neutral molecule which bound to the metal ion by secondary valency is
called as ligand. In complex , metal ion acts as Lewis acid and ligand act
as Lewis base. Ligands are classified according to number of electron pair
in them. The ligand which can donates one e pair to the metal atom is
called Unidentate ligand . The ligand which can donate two electron pair to
the Metal ion is called didentate ligand. The ligand in which two or more
coordination sites are there is called polydentate ligand. 75 Polydentate
ligand forms cyclic structure with metal ion and form Chelate.
i)
Give an example of unidentate neutral ligand.
ii)
What are lewis acids and lewis bases.
iii)
How didentate and Ambidentate ligands are different ? Give example.
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1+1+2
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32
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Read the passage given below and answer the following questions:
Coordination
compounds are formulated and named according to the IUPAC system.
Few rules
for naming coordination compounds are:
(I) In
ionic complex, the cation is named first and then the anion.
(II) In
the coordination entity, the ligands are named first and then the central
metal ion.
(III)
When more than one type of ligands are present, they are named in
alphabetical order of preference with any consideration of charge.
ANSWER
THE FOLLOWING QUESTIONS: -
(i) The IUPAC name of [Ni(CO)4] is
(ii) The IUPAC name of the complex [Pt(NH3)3Br(NO2)Cl]Cl
is
(iii) As per IUPAC nomenclature, the name of the complex
[Co(H2O)4(NH3)2]Cl3 is
(iv) Which of the following represents correct formula of
dichloridobis(ethane-1,2-diamine)cobalt(III) ion?
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1+1+1+1
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SECTION :E
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33
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(a)
Account for the different magnetic behavior of hexacyanoferrate (III) and
hexafluoroferrate (III).
(b) (i)
What type of isomerism is shown by the complex [Cr (H2O)6]Cl3
?
(ii) On
the basis of CFT , write the electronic configuration for d4 ion if Δ0
> P .
(iii)
Write the hybridization and shape of [CoF6] 3- .
Or
a.(i) Write down
the IUPAC name of the following complex :
[Cr(NH3)2CI3(en)]Cl
(en = ethylenediamine)
(ii) Write the formula for the following
complex : Pentaamminenitrito-o-Cobalt (III)
b.Define the
following terms;
(a)
Homoleptic complex
( b)
Hetroleptic complex
( c)
Coordination sphere
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2+3
2+3
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34
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a. Which of the
following is more stable complex and why?
[Co(NH3)6]3+ and
[Co(en)3]3+
b. Why are low
spin tetrahedral complexes not formed?
c. Give evidence that
[Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionization isomers?
OR
a. Compare the following complexes with
respect to their shape, magnetic behaviour and the hybrid orbitals involved
:
(i) [CoF4]2-
(ii) [Cr(H2O)2(C2O4)2]–
(iii) [Ni(CO)4] (Atomic number : Co = 27, Cr = 24, Ni = 28)
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1+2+2
1.5+2+1.5
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35
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For the complex [Fe(en)2Cl2], Cl, (en =
ethylene diamine), identify
(i) the oxidation number of iron,
(ii) the hybrid orbitals and the shape of the complex,
(iii) the magnetic behaviour of the complex,
(iv) the number of geometrical isomers,
(v) whether there is an optical isomer also, show and
(vi) name of the complex. (At. no. of Fe = 26)
OR
a. With proper diagram
explain crystal field splitting for octahedral complexes.
b. What are t2g and
eg orbitals ? Explain.
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½+1+
1/2+1+1+1
3+2
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