IISER Chemistry - Coordination compounds and organometallics
Exam Duration: 45 Mins Total Questions : 30
Which one of the following compounds will not exhibit geometrical isomerism?
- (a)
Pt(NH3)2Cl2
- (b)
[Co(NH3)4Cl2]+
- (c)
[Co(en3)]3+
- (d)
[Co(NH3)5NO2]Cl2
The oxidation state of Pt [(en)H2O)4(NO2)Cl]2+ is
- (a)
+2
- (b)
+4
- (c)
+6
- (d)
-4
The coordination number of a metal in coordination compound is
- (a)
sum of primary and secondary valencies
- (b)
same as the oxidation number of the central metal atom
- (c)
same as the primary valency
- (d)
same as the secondary valency
The brow ring test for NO-2 and NO-3 is due to the formation of complex ion with the formula:
- (a)
[Fe(H2o)(NO5)]2+
- (b)
[Fe(H2O)5NO]2+
- (c)
[Fe(NO)(CN)5]2+
- (d)
[Fe(H2O)6]2+
Which one is an example of octahedral complex?
- (a)
FeF3-
- (b)
[Zn(NH3)4]2+
- (c)
[Ni(CN)4]2-
- (d)
[Cu(NH3)4]2+
The formula of dicynobis(oxalato) nicklate (II) is
- (a)
K3[Ni2(CN)2(OX)2]
- (b)
K4[Ni(CN)2(OX)2]
- (c)
K2[Ni(CN)2(OX)2]
- (d)
K4[Ni(CN)(OX)2]
In a complex [Pt(NH3)2Cl2], the distance between Cl- and Cl- is 2.28 Ao. The possible geomentry of the complex can be
- (a)
square pyramidal
- (b)
tetrahedral
- (c)
cis square planer
- (d)
trans square planar
The effective atomic number (EAN) of 24Cr [Cr(NH3)6]Cl3 is
- (a)
24
- (b)
27
- (c)
30
- (d)
33
In an isomer of [Co(NH3)4Cl2] two chlorine atoms and the cobalt atom are all collinear. This is a
- (a)
linkage isomer
- (b)
coordination sphere isomer
- (c)
trans isomer
- (d)
cis isomer
Which of the following ligands is a bidentate
- (a)
EDTA
- (b)
Ethylene diamine
- (c)
Acetate
- (d)
Pyridine
Ligand in a complex salt are
- (a)
Anions linked by coordinate bonds to a central metal atom or ion
- (b)
Cations linked by coordinate bonds to a central metal atom or ion
- (c)
Molecules linked by coordinate bonds to a central metal atom or ion
- (d)
Ions are molecules linked by coordinate bonds to a central metal atom or ion
A group of atoms can function as a ligand only when
- (a)
it is a small molecules
- (b)
it has an unshared electron pair
- (c)
it is a negatively charged ion
- (d)
it is a positively charged ion
A solution of a potassium ferrocyanide would contain......ions
- (a)
2
- (b)
3
- (c)
4
- (d)
5
K4[Fe(CN)6]is called
- (a)
Potassium hexacyanoferrate (II)
- (b)
Potassium ferricyanide
- (c)
Potassium hexacyanoferrate (III)
- (d)
Praussian blue
The number of d-electrons in [Cr(H2O)6]3+[At No. of Cr=24] is
- (a)
2
- (b)
3
- (c)
4
- (d)
5
Amongst 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+
The oxidation number of Pt in [Pt(C2H4)Cl3] is
- (a)
+1
- (b)
+2
- (c)
+3
- (d)
+4
Identify the species with an atom in + 6 oxidation state present in the following complexes
- (a)
\(Cr{ O }_{ 2 }{ Cl }_{ 2 }\)
- (b)
\(\left[ Cr{ \left( CN \right) }_{ 6 } \right] ^{ 3- }\)
- (c)
\(\left[ Cr{ \left( CN \right) }_{ 6 } \right] ^{ 3- }\)
- (d)
\(Mn{ O }_{ 4 }^{ - }\)
The most stable complex compound is formed by
- (a)
\(Cu^{2+}\)
- (b)
\(Ni^{2+}\)
- (c)
\(Mn^{2+}\)
- (d)
\(Fe^{3+}\)
The coordination number of Co in \([Co(NH_{3})_{5}Cl]Cl_{2}\) is
- (a)
2
- (b)
5
- (c)
6
- (d)
1
The complexes \([Cr(C_{2}O_{4})_{3}] \ [Co(NH_{3})_{6}]\) and \([Cr(NH_{3})_{6}] \ [Co(C_{2}O_{4})_{3}]\) are
- (a)
geometrical isomers
- (b)
ionisation isomers
- (c)
linkage isomers
- (d)
coordinate isomers
Square planar coordinate complexes of the type Mabcd [Where, a,b,c and d are monodentate] shows
- (a)
two trans and one cis isomers
- (b)
one cis and one trans isomers
- (c)
two cis and one trans isomers
- (d)
two cis and two trans isomers
The complexes \([Ni(CN)_{4}]^{2-}\) and \([Ni(CO)_{4}]\)
- (a)
contains Ni atom in same oxidation state in both the complexes
- (b)
possess square planar geometry
- (c)
possess tetrahedral geometry
- (d)
have square planar and tetrahedral geometry respectively
Crystal field stabilisation energy of \(d^{4}\) (high spin) complex is
- (a)
\(-1.8\ \Delta_{0}\)
- (b)
\(-1.2\ \Delta_{0}\)
- (c)
\(-1.6\ \Delta_{0}\)
- (d)
\(-0.6\ \Delta_{0}\)
The colour of the coordination compounds depends on the crystal field splittings.What will be the correct order of absorption of the wavelength of light in the visible region. for the complexes, \([Co(NH_{3})_{6}]^{3+} , [Co(CN)_{6}]^{3-}\) and \([Co(H_{2}O)_{6}]^{3+}\)
- (a)
\([Co(CN)_{6}]^{3-} > [Co(NH_{3})_{6}]^{3+}>[Co(H_{2}O)_{6}]^{3+}\)
- (b)
\([Co(NH_{3})_{6}]^{3+}>[Co(H_{2}O)_{6}]^{3+}>[Co(CN)_{6}]^{3+}\)
- (c)
\([Co(H_{2}O)_{6}]^{3+} > [Co(NH_{3})_{6}]^{3+}>[Co(CN)_{6}]^{3-}\)
- (d)
\([Co(CN)_{6}]^{3-} > [Co(NH_{3})_{6}]^{3+}>[Co(H_{2}O)_{6}]^{3+}\)
The reaction of sodium nitroprusside with sulphide ion results in the formation of purple coloured compound
- (a)
\([Fe(NO)_{5}CN]^{-}\)
- (b)
\([Fe(CN)_{5}NOS]^{3-}\)
- (c)
\([Fe(CN)_{5}NOS]^{4-}\)
- (d)
\([Fe(CN)_{5}NO]^{3-}\)
Which statement is incorrect for metal - ligand complex ?
- (a)
Larger the value of inoisation potential of central metal, stronger is the bond
- (b)
Greater the dipole moment of ligand, more stable is metal ligand bond
- (c)
Greater the charge on ligand, more stronger is the bond
- (d)
Larger the ligand, less stable is the metal-ligand complex
The number of isomers of \([Cu^{II}(NH_{3})_{4}] [Pt^{II}Cl_{4}]\) are
- (a)
6
- (b)
3
- (c)
4
- (d)
5
The octahedral complex of a metal ion \(M^{3+}\) with four monodentate ligands \(L_{1},L_{2},L_{3} \ and \ L_{4}\) absorb wavelengths in the region of red, green,yellow and blue respectively. The increasing order of ligand strength of the four ligands is
- (a)
\(L_{4}
- (b)
\(L_{1} < L_{3},
- (c)
\(L_{3} < L_{2},
- (d)
\(L_{1} < L_{2}, < L_{4} < L_{3}\)
Which one has largest number of isomers?
- (a)
\([Co(en)_{2}Cl_{2}]^{+}\)
- (b)
\([Co(NH_{3})_{5}Cl]^{2+}\)
- (c)
\([Ir(PR_{3})_{2}H(Co)]^{2+}\)
- (d)
\([Ru(NH_{3})Cl_{2}]^{+}\)
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