Co-ordination Compounds MCQs – 5

1) The possible number of isomers for the complex [MCI2Br2] SO4 is :

a) 1
b) 2
c) 4
d) 5

2) The coordination number and oxidation number of Cr in K3 [Cr (C2O4)3] are respectively,
a) 4 and +2
b) 6 and + 3
c) 3 and + 3
d) 3 and 0

3) Which type of isomers are [Co (NH3)5 Br] SO4 and [Co (NH3)5 SO4] Br ?
a) Hydrate isomers
b) lonization isomers
c) Ligand isomers
d) Coordination isomers

4) The number of geometrical isomers for [Pt (NH3)2 CI2] is
a) Two
b) One
c) Three
d) Four

5) Which of the following statements are correct about [Fe (H2O)5NO] SO4? Â
a) It gives a brown ring test for nitrates
b) The oxidation number of Fe is + 1
c) The charge on NO is + 1
d) All of the above

6) The correct IUPAC name of K4 [Fe (CN)6] is
a) Tetra potassium ferrous cyanide
b) Potassium ferri cyanide
c) Potassium ferro cyanide
d) Potassiumhexacyanoferrate (II)

7) Which of the following represents the IUPAC name of [Co(NH3)6]CI?
a) Hexaaminecobalt (III) chloride
b) Cobalt (III) hexamine tri-chloride
c) Cobalt hexamine chloride
d) Hexamine cobalt chloride

8) Q@ The number of sigma and pi bonds in the compound respectively are
a) 19, 11
b) 19,5
c) 13, 11
d) 7, 3

9) The oxidation state of Cr in CrO5 is
a) 4
b) 2
c) 10
d) 6

10) Which of the following is a π-acid ligand ?
a)
b) CO
c)
d) Ethylenediamine

11) Which of the following is the odd one out ?
a) Potassium ferricyanide
b) Ferrous ammonium sulphate
c) Potassium ferrocyanide
d) Tetraamminecopper(ll) sulphate

12) Which of the following is not an organometallic compound ?
a) Ethyl magnesium bromide
b) Tetraethyl lead
c) Sodium ethoxide
d) Trimethyl aluminium

13) Generally a group of atoms can function as a ligand if
a) They are positively-charged ions
b) They are free radicals
c) They are either neutral molecules or negatively charged ions
d) None of the above

14) Which of the following complexes will show geometrical as well as optical isomerism ? en = ethylenediamine
a)
b)
c)
d)

15) The co-ordination number of a metal in co-ordination compounds is the
a) Same as the primary valency
b) Sum of the primary and secondary valencies
c) Same as the secondary valency
d) none of the above

16) The oxidation Number of cobalt in K [Co (CO)4] is
a) + 1
b) + 3
c) -1
d) 3

17) [Pt (NH3)4CI2] Br2 and [Pt (NH3)4 Br2] CI2 are related to each other as
a) Optical isomers
b) Co-ordinate isomers
c) lonisation isomers
d) Linkage isomers

18) The effective atomic number of the central Cu (At. No. 29) metal in [Cu (NH3)4] SO4 is
a) 29
b) 30
c) 35
d) 36

19) The oxidation state and coordination number of Cr in [Cr (C2O4)3]3- ion are
a) + 6 and 3
b) + 3 and 6
c) + 6 and 6
d) + 3 and 3

20) The name of the complex [Pt (NH3)6] CI4 is
a) Hexaamineplatinum (IV) chloride
b) Hexamineplatinum (II) chloride
c) Tetrachloro hexamineplatinum (IV)
d) Tetrachloro hexamineplatinum (II)

21) In the compound lithiumtetrahydroaluminate, the ligand is
a)
b) H
c)
d) None of these

22) The number of unpaired electrons in Ni (CO)4 is
a) Zero
b) One
c) Four
d) Five

23) The number of geometrical isomers of the complex [Co (NO2)3 (NH3)3] is
a) 2
b) 4
c) 3
d) 0

24) The oxidation state of Fe in the brown ring complex [Fe (H2O)5 NO] SO4 is
a) + 1
b) + 2
c) + 3
d) + 4

25) Which of the following is paramagnetic ?
a)
b)
c)
d)

26) The coordination and oxidation number of X in the compound [X (SO4) (NH3)5] Cl respectively will be
a) 10 and 3
b) 6 and 4
c) 2 and 6
d) 6 and 3

27) Which of the following complex will give a white precipitate with BaCI2 (aq) ?
a)
b)
c)
d) Both (a) and (c)

28) The formula, dichlorobis (urea) copper (II) is
a)
b)
c)
d)

29) The oxidation state of the metal ion in the complex [Fe(CN)6]3-is
a) + 3
b) -3
c) + 6
d) -6

30) Which of the following is an organometallic compound ?
a) Lithium methoxide
b) Lithium acetate
c) Lithium dimethylamide
d) Methyl lithium

31) In which of the following compounds does the central metal atom obey the EAN rule ?
a)
b)
c)
d) all the above

32) Which is not a π-bonded complex?
a)
b) Ferrocene
c) Dibenzene chromium
d) Tetraethyl lead

33) The total number of possible isomers of the complex compound is
a) 3
b) 6
c) 5
d) 4

34) A complex compound of cobalt has a molecular formula containing five NH3 molecules, one nitro group and two chlorine atoms for one Co atom. One mole of this compound produces three mole ions in aq. solution. On reacting with excess of AgNO3 solution, two moles of AgCI get precipitated. The ionic formula of the compound is
a)
b)
c)
d)

35) In the nitroprusside ion, the iron and NO exist as Fe11 and rather than Fe111 and NO. These forms can be differentiated by
a) Estimating the concentration of iron
b)
c) Measuring the solid state magnetic moment
d) Thermally decomposing the compound

36) Which one of the following shows maximum paramagnetic character ?
a)
b)
c)
d)

37) The IUPAC name of [Pt (NH3)3Br (NO2)CI] Cl is
a) Triaminechlorobromonitroplatinum(IV) chloride
b) Triaminebromonitrochloroplatinum(IV) chloride
c) Triaminebromochloronitroplatinum(IV) chloride
d) Triaminenitrochlorobromoplatinum(IV) chloride

38) AgCI precipitate dissolves in NH4OH due to the formation of
a)
b)
c)
d)

39) Cobalt is present in
a)
b)
c)
d)

40) Which one of the following is an antiknocking compound ?
a)
b)
c)
d) None of these

41) A species acts as a ligand if
a) It is positively charged
b) It is negatively charged
c) It contains a lone pair of electrons
d) It has a small size

42) Which kind of hybridization does the Ni atom in Ni (CO)4 show?
a)
b)
c)
d)

43) Which of the following species represents an example of dsp2 hybridization ?
a)
b)
c)
d)

44) The geometry of Ni (CO)4 and Ni (PPh3)2 CI2 are
a) Both square planar
b) Tetrahedral and square planar respectively
c) Both tetrahedral
d) Square planar and tetrahedral respectively

45) CuSO4 reacts with KCN solution and forms
a) Cu(CN)
b)
c)
d)

46) In which of the following compounds is the transition metal in zero oxidation state ?
a)
b)
c)
d)

47) What is the oxidation number of Co in [Co (NH3)4CI (NO2)] ?
a) + 2
b) + 3
c) + 4
d) + 5

48) Which of the following is paramagnetic ?
a)
b)
c)
d)

49) What is the shape of the Fe (CO)5 molecule ?
a) Tetrahedral
b) Octahedral
c) Trigonal bipyramidal
d) Square pyramidal

50) Mg is an important component of which biomolecule occurring extensively in the living world ?
a) Haemoglobin
b) Chlorophyll
c) Florigen
d) ATP

51) Which of the following will give four isomers?
a)
b)
c)
d)

52) The valency of Cr in the complex [Cr(H2O)4CI2]+is
a) 1
b) 3
c) 5
d) 6

53) Which of the following is expected to be a paramagnetic complex ?
a)
b)
c)
d)

54) The IUPAC name of Na3 [Co (NO2)6] is
a) Sodium cobaltinitrite
b) Sodium hexanitrito cobaltate (III)
c) Sodium hexanitro cobalt (III)
d) Sodium hexanitro cobaltate (III)

55) According to the postulates of Werner for coordination compounds, the
a) Primary valency is ionizable
b) Secondary valency is ionizable
c) Primary and secondary valencies are non-ionizable
d) primary valency only is non-ionizable

56) The correct formula of the complex formed in the brown ring test for nitrates is
a)
b)
c)
d)

57) AgCI is soluble in NH4OH solution. The solubility is due to the formation of
a) AgOH
b)
c)
d)

58) The number of isomers exhibited by [Cr(NH3)3CI3] is
a) 2
b) 3
c) 4
d) 5

59) For the square planar complex [M (a) (b) (c) (d)] (where M = central metal and a, b, c and d are monodentate ligands), the number of possible geometrical isomers are
a) 1
b) 2
c) 3
d) 4

60) The complex ion which has no d electrons in the central metal atom is (At. No. Cr=24, Mn=25, Fe=26, Co=27)
a)
b)
c)
d)

61) The correct order of hybridization of the central atom in the following species NH3, [PtCI4]2-, PCI5 and BCI3 is (At. No. Pt=78)
a)
b)
c)
d)

62) The brown ring test for nitrates is due to the formation of
a)
b)
c)
d)

63) Chloroplatinic acid is
a) Monobasic
b) Dibasic
c) Tribasic
d) None

64) The oxidation number of the central metal ion in Wilkinsons catalyst is
a) +1
b) + 4
c) + 2
d) + 6

65) Which of the following complexes has the highest stability constant at 298 K ?
a)
b)
c)
d)

66) Which reagent can be used to identify the Ni2+ ion ?
a) DMG
b) EDTA
c) PY
d)

67) Which of the following metal ions is present in Ziegler-Natta catalyst ?
a)
b)
c)
d)

68) Which of the following has a flexidentate character ?
a) EDTA
b) en
c) PY
d) OX

69) The coordination number and oxidation number of X in the compound [X (SO4) (NH3)5] will be
a) 10 and 3
b) 1 and 6
c) 6 and 2
d) 6 and 4

70) With which of the following general formulae is Fac-Mer isomerism associated ?
a)
b)
c) MABCD
d)

71) In the complex Fe (CO)X, the value of x is
a) 3
b) 4
c) 5
d) 6

72) Which of the following acts as a ligand but does not possess any unshared pair of electrons ?
a)
b)
c) en
d)

73) The hybridization of the central metal ion and the shape of Wilkinson’s catalyst is
a)
b)
c)
d)

74) A ligand having an unshared pair of electrons can be a
a) Neutral molecule
b) Positively charged ion
c) Negatively charged ion
d) All of the above

75) In which of the following is the oxidation number of the metal ion zero ?
a)
b)
c) Cu
d) a, b and c

76) Select the compounds where iron is in the + 2 oxidation state
a)
b)
c)
d) Both (b) and (c)

77) The compound K3 [Co (NO2)6] is called
a)
b) Potassium cobaltinitrite
c) Potassium hexanitrocobaltate(lll)
d) All of the above

78) The compound Na2 [Fe (CN)5NO] is called
a) Sodium pentacyanonitrosoniumferrate (II)
b) Sodium nitroprusside
c) Sodium pentacyanonitrosylferrate(lll)
d) Both (a) and (b)

79) The compound K4 [Fe (CN)6] is called
a) Potassium ferrocyanide
b) Potassium ferricyanide
c) Both (a) and (d)
d) Potassium hexacyanoferrate (II)

80) K4 [Fe (CN)6] is used in the identification of
a)
b)
c)
d) Both (a) and (c)

81) Cu2+ and  Cd2+ ions can be separated by their
a) Oxalate complexes
b) Chelates
c) Cyano complexes
d) Formation of sulphides

82) Dimethyl glyoxime is used for the estimation of
a) Nickel
b) Cobalt
c) Zinc
d) Manganese

83) On adding KCN solution to CuSO4 solution the colour of CuSO4 is discharged due to
a) The complex ion formation
b) The formation of Cu ( CN )2
c) The formation of Cu ( CN )3
d) The formation of Cu ( OH )2

84) An example of an ambident nucleophile is
a) CN
b) CH3
c) OH
d) All of these

85) The complex ions [Co ( NH3) 5  ( NO2 ) ] 2+ and  [ Co ( NH3) 5 ( ONO ) ] 2+ are called   a) Ionization isomers
b) Linkage isomers
c) Co – ordination isomers
d) Geometrical isomers

86) K3 [ Fe ( C2O4 ) 3 exhibits
a) Geometrical isomerism
b) Optical isomerism
c) Coordination isomerism
d) Ionisation isomerism

87) The number of s bonds in Zeus’s salt are
a) 6
b) 8
c) 4
d) None of these

88) The formula of calcium cyanamide is
a) Ca (CN)2
b) Ca CN2
c) Ca NCN
d) Ca CHNH2

89) The compound which is not an organometallic compound is
a) C6H5MgBr
b) C6H5Fi ( OC3H7) 2
c) C6H5MgBr and C6H5Fi ( OC3H7) 2
d) Ti (OC2H5) 4

90) The oxidation state of Fe in [ Fe ( EDTA ) ] -1 is
a) -3
b) +2
c) +1
d) +3

91) The EAN of Mn in Mn2 (CO) 10 is
a) 32
b) 36
c) 34
d) None of these

92) The complex formed during the fixing of a negative in photography is
a) [ Ag ( S2O3) 2 ] -1
b) [ Ag ( S2O3) 2 ] 2-
c) [Ag (S2O3) 2] 3-
d) None of these

93) An example of an outer orbital complex is
a) [ Fe ( H2O ) 6 ] 3+
b) [ Fe F6 ] 3-

c) [ Fe ( H2O ) 6 ] 3+  and   [ Fe F6 ] 3-
d) None of these

94) Chelated compounds can be formed by
a) Phen
b) Bipy
c) Phen and Bipy
d) None of these

95) The hexafluoroferrate ( III ) ion is an outer orbital complex. The number of unpaired electrons present in it is
a) 1
b) 5
c) 4
d) Unpredictable

96) Which of the following complex species involves  d2sp3 hybridization?
a) 1
b) 2
c) 3
d) 4

97) The composition of the complex formed when the ore argentite is treated with NaCN is
a) Na3 [ Ag ( CN ) 6 ]
b) Na [ Au ( CN ) 2 ]
c) Na [ Au ( CN ) 6 ]
d) Na [ Ag ( CN ) 2 ]

98) The order of stability of metal – EDTA complexes of Ba2+ , Mn 2+, Zn 2+ , Fe 3+ decreases in the order
a) Ba2+ > Mn 2+ > Fe 3+ > Zn 2+
b) Zn2+ > Fe 3+ > Mn 2+ > Ba 2+
c) Mn2+ > Zn2+ > Ba 2+ > Fe 3+
d) Fe3+ > Zn 2+> Mn 2+ > Ba 2+

99) The geometry of complexes with the coordination number four is
a) Octahedral
b) Square planar
c) Tetrahedral
d) either square planar or Tetrahedral

100) The complex ammonium cobalt nitrite is derived from which oxidation state of cobalt?
a) Co
b) Co+
c) Co2+
d) Co3+


Answer

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