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INORGANIC CHEMISTRY
CHAPTER 1 METALLURGY
QUESTIONS FOR DISCUSSION
1. The number of unpaired electrons in Fe3+ (Z = 26) are
a) 4
b) 3
c) 6
2. The shape of cuprammonium ion is
a) tetrahedral
b) trigonal
d) 5
c) square planar
d) octahedral
3. Pick out the complex compound in which the central metal atom obeys EAN rule strictly
a) [Cu(NH3)4]SO4
b) [Cr(H2O)6]Cl3
c) K3[Fe(CN)6]
d) K4[Fe(CN)6
4. Which of the following statements is incorrect?
a) In K4[Fe(CN)6] the ligand has satisfied both primary and secondary valencies of ferrous ion
b) In [Cu(NH3)4]SO4, the ligand has satisfied only the secondary valency of copper
c) In K3[Fe(CN)6], the ligand has satisfied only the secondary valency of ferric acid
d) In K3[Fe(CN)6, the ligand has satisfied both primary and secondary valencies of ferric acid
5. Which compound is zero valent metal complex?
a) [Pt(NH3)2Cl2]
b) [Cu(NH3)4]SO4
c) K3[Fe(CN)6]
d) [Ni(CO)4]
6. In which of the following complex ion, the central metal ion is in a state of sp3d2 hybridisation?
a) [Co (NH3)6]3+
b) [CoF6]3–
c) [Cr(NH3)6]3+
d) [Fe(CN)6]3–
7. Which of the following can participate in linkage isomerism?
a) H2
b) NO2
c) NH3
3) H2O
8. The number of unidentate ligands in the complex ion is called
a) oxidation number
b) primary valency
c) Coordination number
d) EAN
9. The oxidation state of iron in K4 [Fe(CN)6] is
a) 1
b) 4
d) 2
c) 3
10. Which complex can not ionize in solution?
a) [CoCl3 (NH3)3]
b) K4[Fe(CN)6]
c) K2 [Pt (F6)]
d) [Pt (NH3)6]Cl4
11. A complex compound in which the oxidation number of a metal is zero is
a) [Ni (CO)4]
b) Pt (NH3)4]Cl2
c) K4 [Fe (CN)6]
d) K3 [Fe (CN)6]
12. A ligand can also be regarded as
a) Lewis base
b) Bronsted acid
13. The IUPAC name of [Co(NH3)5ONO]2+ ion is
a) pentaamminenitrocobalt(III) ion
c) pentaamminenitrocobalt(IV) ion
c) Lewis acid
d) Bronsted base
b) pentaamminenitrocobalt(IV) ion
d) pentaamminenitritocobalt(III) ion
14. The oxidation state of Fe in the brown ring complex: [Fe(H2O)5NO]SO4 is
a) +2
b) +1
c) +3
d) 0
15. Which one of the following is wrongly matched?
2
a) Ni (CO) 4  – neutral ligand
b) Cu ( NH 3 ) 4  – square planar
c) Co(en) 3   follows EAN rule
d) Fe(CN ) 6   sp 3 d 2
3
3
16. The IUPAC name of K2[Ni(CN)4] is……..
a) Potassium tetracyanatonickelate (II)
b) Potassium tetracyanonickelate(II)
c) Potassium tetracyanonickel (III)
d) Potassium tetracyanatonickel (II)
17. The IUPAC name of the complex [Co(NH3)4Cl2]Cl is
a) tetraammine dichloro cobalt (III) chloride
b) dichloro tetraammine cobalt (III) chloride
c) tetraammine dichloro cobalt (IV) chloride
d) tetraammine dichloro cobalt (II) chloride
1
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18. The type of isomerism present in nitropentamine chromium (III) chloride is [AIEEE 2002]
a) optical
b) linkage
c) ionization
d) polymerisation
19. The most stable ion is
a) [ Fe(OH ) 3 ]3
b) [ Fe(Cl ) 6 ]3
c) [ Fe(CN ) 6 ]3
d) [ Fe( H 2 O) 6 ]3
20. In the coordination compound, K 4 [Ni(CN) 4 ], the oxidation state of nickel is
a) –1
b) 0
c) +1
d) +2
[AIEEE 2003]
21. Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in alkaline solutions but not in
acidic solutions. What is the reason for it?
a) In acidic solutions hydration protects copper ions
b) In acidic solutions protons coordinate with ammonia molecules forming NH 4 ions and NH3
molecules are not available
c) In alkaline solutions insoluble Cu(OH)2 is precipitated which is soluble in excess of any alkali
d) Copper hydroxide is an amphoteric substance.
22. One mole of the complex compound Co(NH3)5Cl3, gives 3 moles of ions on dissolution in water.
One mole of the same complex reacts with two moles of AgNO3 solution to yield two moles of
AgCl(s). The structure of the complex is
a) [Co ( NH 3 ) 5 Cl ]Cl 2
b) [Co ( NH ) 3 Cl 3 ].2 NH 3
c) [Co ( NH 3 ) 4 Cl 2 ]Cl . NH 3
d) [Co ( NH 3 ) 4 Cl ]Cl 2 . NH 3
23. Which one of the following has the regular tetrahedral structure?
a) XeF4
b) [ Ni(CN ) 4 ] 2
c) BF 4
(Atomic nos: B = 5, S = 16, Ni = 28, Xe = 54)
d) SF 4
24. Among the properties (a) reducing (b) oxidizing (c) complexing, the set of properties shown by
CN– ion towards metal species is
a) a, b
[AIEEE 2004]
b) a, b, c
c) c, a
d) b, c
25. The coordination number of a central metal atom in a complex is determined by
a) the number of ligands around a metal ion bonded by sigma bonds
[AIEEE 2004]
b) the number of only anionic ligands bounded to the metal ion
c) the number of ligands around a metal ion bonded by sigma and pi-bonds both
d) the number of ligands around a metal ion bonded by pi-bonds
26. Which one of the following complexes is an outer orbital complex?
[AIEEE 2004]
2
3
4
a) [ Fe(CN ) 6 ]
b) [ Ni( NH 3 ) 6 ]
c) [Co( NH 3 ) 6 ]
d) [ Mn(CN ) 6 ] 4
(Atomic nos: Mn = 25; Fe = 26; Co = 27; Ni = 28)
27. Coordination compounds have great importance in biological systems. In this context which of
the following statements is incorrect?
[AIEEE 2004]
a) Chlorophylls are green pigments in plants and contain calcium
b) Carboxypeptidase-A is an enzyme and contains zinc
c) Cyanocobalamin is B12 and contains cobalt
d) Haemoglobin is the red pigment of blood and contains iron
28. Which one of the following has largest number of isomers?
[AIEEE 2004]

2

a) [ Ru ( NH 3 ) 4 Cl 2 ]
b) [Co(en) 2 Cl2 ]
c) [ Ir ( pr3 ) 2 H (CO)]
d) [Co( NH 3 ) 5 Cl ] 2
(R = alkyl group, en = ethylenediamine)
29. The oxidation state of Cr in [Cr(NH3)4Cl2]
a) +3
b) +2
[AIEEE 2005]
c) +1
2
d) 0
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30. Which of the following compounds shows optical isomerism?
a) [Cu(NH3)4]2+
b) [ZnCl4]2–
c) [Cr(C2O4)3]3–
[AIEEE 2005]
d) [Co(CN)6]3–
31. Which one of the following cyano complexes would exhibit the lowest value of paramagnetic
behaviour?
[AIEEE 2005]
3–
3–
3–
a) [Cr(CN)6]
b) [Mn(CN)6]
c) [Fe(CN)6]
d) [Co(CN)6]3–
(At. Nos: Cr = 24, Mn = 25, Fe = 26, Co = 27)
32. The IUPAC name for the complex [Co(NO2)(NH3)5]Cl2 is
[AIEEE 2006]
a) pentaammine nitrito-N-cobalt(III) chloride
b) nitrito-N-pentaamminecobalt(III) chloride
c) nitrito-N-pentaamminecobalt(II) chloride
d) pentaamminenitrito-N-cobalt(II) chloride
33. Which one of the following has a square planar geometry?
a) [FeCl4]2–
b) [NiCl4]2–
c) [PtCl4]2–
(At nos. Co = 27, Ni = 28, Fe = 26, Pt = 78)
[AIEEE 2007]
d) [CoCl4]2–
34. In which of the following octahedral complexes of Co(at. no 27), will the magnitude of Δ0 be
highest?
[AIEEE 2008]
a) [Co(NH3)6]3+
b) [Co(CN)6]3–
c) [Co(C2O4)3]3–
d) [Co(H2O)6]3+
35. The coordination number and the oxidation state of the element ‘E’ in the complex
[E(en)2(C2O4)]NO2 (where (en) is ethylene diamine) are, respectively,
[AIEEE 2008]
a) 6 and 3
b) 6 and 2
c) 4 and 2
d) 4 and 3
36. Which of the following pairs represents linkage isomers?
a) [Co(NH3)5NO3]SO4 and [Co(NH3)5SO4]NO3
b) [PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2
c) [Cu(NH3)4][PtCl4] and [Pt(NH3)4][CuCl4]
d) [Pd(PPh3)2(NCS)2] and [Pd(PPh3)2(SCN)2]
[AIEEE 2009]
37. Which of the following on heating with aqueous KOH, produces acetaldehyde?
a) CH2ClCH2Cl
b) CH3CHCl2 c) CH3COCl2 d) CH3CH2Cl
[AIEEE 2009]
38. Which of the following has an optical isomer?
[AIEEE 2009]
a) [Co(H2O)4(en)]3+
b) [Co(en)2(NH3)2]3+
c) [Co(NH3)3Cl]+
d) [Co(en)(NH3)2]2+
39. Which one of the following has an optical isomer?
[AIEEE 2010]
3+
3+
2+
a) [Co(en)3]
b) [Co(H2O)4(en)]
c) [Zn(en)2]
d) [Zn(en)(NH3)2]2+s
(en = ethylenediamine)
40. Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?
[AIEEE 2011]
a) The complex is paramagnetic
b) The complex is an outer orbital complex
c) The complex gives white precipitate with silver nitrate solution
d) The complex involves d2sp3 hybridisation and is octahedral in shape
41. The magnetic moment (spin only) of [NiCl4]2– is:
[AIEEE 2011]
a) 5.46 BM
b) 2.82 BM
c) 1.41 BM
d) 1.82 BM
42. Which one of the following complexes will have four different isomers?
a) [Co(en)2Cl2]Cl
b) [Co(en)(NH3)2Cl2]Cl
c) [Co(PPH3)2(NH3)Cl2]Cl
[AIPMT 2000]
d) [Co(en)3]Cl3
43. In the separation of Cu2+ and Cd2+ in 2nd group of qualitative analysis of cations, tetramine
copper(II) sulphate and tetrammine cadmium(II) sulphate react with KCN to form the
correcponding cyano complexes, which one of the following pairs of the complexes and their
relative stability enables the separation of Cu2+ and Cd2+?
[AIPMT 2000]
a) K3[Cu(CN)4] : less stable and K2[Cd(CN)4] : more stable
b) K3[Cu(CN)4] : more stable and K2[Cd(CN)4] : less stable
c) K2[Cu(CN)4]: less stable and K2[Cd(CN)4] : more stable
d) K2[Cu(CN)4]: more stable and K2[Cd(CN)4] : less stable
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44. Which one of the following will give maximum number of isomers?
a) [Co(NH3)4Cl2] b) [Ni(en)(NH3)4]2+
c) [Ni(C2O4)(en)2]2–
45. Co-ordination number of Ni in [Ni(C2O4)3]4– is:
a) 3
b) 6
c) 4
[AIPMT 2001]
d) [Cr(SCN)2(NH3)4]+
[AIPMT 2001]
d) 2
46. Which of the following organometallic compound has σ and π bond?
a) [Fe(η5 – C5H5)2]
b) K[PtCl3(η2 – C2H4)] c) [Co(CO)5NH3]2+
47. Which statements is incorrect?
a) Ni(CO)4 – Tetrahedral, paramagnetic
c) Ni(CO)4 – Tetrahedral, diamagnetic
[AIPMT 2001]
d) Fe(CH3)3
[AIPMT 2001]
b) Ni(CN ) – Square planar, diamagnetic
d) [Ni(Cl)4] – Tetrahedral, paramagnetic
2
4
2–
48. Which of the following will exhibit maximum ionic conductivity?
a) K4[Fe(CN)6]
b) [Co(NH3)6]Cl3
c) [Cu(NH3)4]Cl2
[AIPMT 2001]
d) [Ni(CO)4]
49. Atomic number of Cr and Fe are respectively 24 and 26, which of the following paramagnetic
with the spin of electron:
[AIPMT 2002]
4
3
a) [Cr (CO) 6 ]
b) [ Fe(CO) 5 ]
c) [ Fe(CN ) 6 ]
d) [Cr ( NH 3 ) 6 ]
50. The hypothetical complex chloro diaquatriammine cobalt (III) chloride can be represented as:
a) [CoCl( NH 3 ) 3 ( H 2 O) 2 ]Cl2
b) [Co( NH 3 ) 3 ( H 2 O)Cl3 ]
[AIPMT 2002]
c) [Co( NH 2 ) 3 ( H 2 O) 2 Cl ]
d) [Co( NH 3 ) 3 ( H 2 O) 3 ]Cl3
51. CuSO4 when reacts with KCN forms CuCN. Which is insoluble in water. It is soluble in excess
of KCN, due to formation of the following complex:
[AIPMT 2002]
a) K2[Cu(CN)4]
b) [K3[CuCN)4]
c) CuCN2
d) Cu[KCu(CN)4]
52. The number of unpaired electrons in the complex ion [CoF6]3– is:
a) 4
b) zero
c) 2
(Atomic number Co = 27)
[AIMPT 2003]
d) 3
53. Which of the following co-ordination compounds would exhibit optical isomerism?
a) Pentaamminenitrocobalt (III) iodide
b) Diamminedinitroplatinum (II)
[AIPMT 2004]
c) trans-dicyanobis (ethylenediamine)
d) Tris-(ethylendiamine) cobalt(III) bromide
54. Among [Ni(CO) 4 ]2 , [Ni(CN) 4 ]2 , [NiCl 4 ]2 species, the hybridization states of the Ni atom
are respectively: (At. no of Ni = 28)
[AIPMT 2004]
a) sp 3 , dsp 2 , dsp 2
b) sp 3 , dsp 2 , sp 3
c) sp 3 , sp 3 , dsp 2
d) dsp 2 , sp 3 , sp
55. CN– is strong field ligand. This is due to the fact that:
[AIPMT 2004]
a) it carries negative charge
b) it is a pseudohalide
c) it can accept electrons from metal species d) it forms high spin complexes with metal species
56. Considering H2O as weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will
be (At. no of Mn = 25):
[AIPMT 2004]
a) three
b) five
c) two
d) four
57. Which of the following does not have a metal-carbon bond?
a) Al(OC2H5)3
b) C2H5MgBr
c) K[Pt(C2H4)Cl3]
[AIPMT 2004]
d) Ni(CO)4
58. In an octahedral structure, the pair of d orbitals involved in d2sp3 hybridisation is:
a) d x 2  y 2 , d z 2
b) d x z , d x 2  y 2
c) d z 2 , d x z
d) d xy , d y z
[AIPMT 2004]
59. Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?
(Atomic no: Zn = 30, Cr = 24, Co = 27, Ni = 28)
[AIPMT 2005]
4
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b) [Cr(NH3)6]3+
c) [Co(NH3)6]3+
d) [Ni(NH3)6]2+
60. Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)
a) cis-[Pt (NH3)2 Cl2]
b) trans-[Co(en)2Cl2]
[AIPMT 2005]
c) trans-[Pt(NH3)2Cl2]
d) cis-[Co(en)2Cl2]
61. Copper sulphate dissolves in excess of KCN to give:
a) CuCN
b) [Cu(CN)4]3–
c) [Cu(CN)4]2–
[AIPMT 2006]
d) Cu(CN)2
62. [Co(NH3)4(NO2)2]Cl exhibits:
a) linkage isomerism, ionization isomerism and optical isomerism
b) linkage isomerism, ionization isomerism and geometrical isomerism
c) ionization isomerism, geometrical isomerism and optical isomerism
d) linkage isomerism, geometrical isomerism, and optical isomerism
[AIPMT 2006]
63. [Cr(H2O)6]Cl3 (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution
of 3d electrons in the chromium of the complex is:
[AIPMT 2006]
a) 3d 1x 2  y 2 , 3d 1z 2 , 3d 1x z
b) 3d 1xy , 3d 1x 2  y 2 , 3d 1y z c) 3d 1xy , 3d 1zy , 3d 1x z
d) 3d 1xy , 3d 1yz , 3d 12
z
64. Which of the following will give a pair of enantiomorphs?
a) [Co(NH3)4Cl2]NO2
c) [Co(en)2Cl2]Cl
(en = NH2 CH2 CH2 NH2)
[AIPMT 2007]
b) [Cr(NH3)6][Co(CN)6]
d) [Pt(NH3)4][PtCl6]
65. Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities
[AIPMT 2008]
(At no: Ti = 22, V = 23, Fe = 26, Co = 27)
a) [V (gly)2 (OH)2(NH3)2]+ b) [Fe(en)(bpy)(NH3)2]2+
c) [Co(OX)2(OH)2]–
d) [Ti(NH3)6]3+
66. In which of the following coordination entities the magnitude of Δ0 (CFSE in octahedral field)
will be maximum?
(Atomic number Co = 27)
[AIPMT 2008]
a) [Co(H2O)6]3+
b) [Co(NH3)6]3+
c) [Co(CN)6]3–
d) [Co(C2O4)3]3–
9. An octahedral complex is formed when hybrid orbitals of the following type are involved
a) d2sp3
b) sp2d2
c) sp3
d) dsp2
21. A square planar complex is formed by hybridisation of which atomic orbitals?[AIEEE 2002]
a) s, p x , p y , d yz
b) s, p x , p y , d x2  y 2
c) s, p x , p y , d z2
d) s, p y , p z , d xy
35. Which one of the following has the regular tetrahedral structure?
a) XeF4
b) [Ni(CN)4]2–
c) BF4 –
[AIEEE 2004]
d) SF4
(Atomic nos: B = 5, S = 16, Ni = 28, Xe = 54)
38. The correct order of magnetic moments (spin only values in B. M) among is [AIEEE 2004]
a) [MnCl4 ] 2  [CoCl4 ] 2  [ Fe(CN ) 6 ] 4
b) [ Fe(CN ) 6 ] 4  [CoCl4 ] 2  [MnCl4 ] 2
c) [ Fe(CN ) 6 ] 4  [MnCl4 ] 2  [CoCl4 ] 2
(Atomic nos: Mn = 25, Fe = 26, Co = 27]
47. In Fe(CO)5, the Fe – C bond possesses
a) σ-character only b) π-character only
d) [MnCl4 ] 2  [ Fe(CN ) 6 ] 4  [CoCl4 ] 2
c) both σ and π characters
54. Which one of the following has a square planar geometry?
a) [FeCl4]2–
b) [NiCl4]2–
c) [PtCl4]2–
(At nos: Co = 27, Ni = 28, Fe = 26, Pt = 78]
QUESTIONS FOR PRACTICE
5
[AIEEE 2006]
d) ionic character
[AIEEE 2007]
d) [CoCl4]2–