Co ordination compounds – MCQs 3

1) @ The complex [Co(NH3)5Br]SO4 will give a white precipitate with
a)
b)
c)
d) None

2) Which will not give the usual test for iron?
a)
b)
c)
d)

3) The value of x in the complex Fe(CO)x is
a) 5
b) 4
c) 8
d) 3

4) The hybridisation in Ni(CO)4 is
a) sp
b)
c)
d)

5) The colour of FeSO4 .(NH4)2SO4 .6H2O is
a) Red
b) White
c) Green
d) Blue

6) The number of ions formed in aqueous solution by the compound [Co(NH3)4Cl2]Cl is
a) 2
b) 3
c) 4
d) 7

7) In complexes, the primary valency of the metal is always
a) Ionic
b) Covalent
c) Zero
d) None

8) Which of the following cation does not form an amine complex with excess of ammonia ?
a)
b)
c)
d)

9) Complexes with bidentate ligands are called.
a) Ligands
b) Chelates
c) Complexes
d) None

10) The outer complexes are generally formed by
a) Strong ligands
b) Weak ligands
c) Neutral ligands
d) None

11) Which of the following will exhibit cis-trans isomerisation ?
a)
b)
c) MABCD
d)

12) All ligands are
a) Lewis acids
b) Lewis bases
c) Neutral
d) None

13) The shape of the cobalt hexamine cation, which has its central cobalt atom surrounded by six ammonia molecules is
a) Tetrahedral
b) Octahedral
c) Square planar
d) Trigonal

14) The complex [Pt(NH3)6]Cl4 furnishes
a) 5 ions
b) 6 ions
c) 4 ions
d) 2 ions

15) Which of the following is not an organometallic compounds ?
a) Trimethyl boron
b) Trimethyl orthoborate
c) Diethyl magnesium
d) Butyl ethyl mercury

16) Which one of the following will give a white precipitate with AgNO3 in aqueous solution ?
a)
b)
c)
d)

17) @ Which of the following has tetrahedral geometry ?
a)
b)
c)
d)

18) The complex [Co(NH3)3Cl3] is
a) Neutral
b) Cationic
c) Anionic
d) None

19) A group of atoms can function as a ligand only when
a) It is a small molecule
b) It has an unshared electron pair
c) It is a negatively charged ion
d) It is a positively charged ion

20) The metal hydroxide which is soluble in excess of NH4OH is
a)
b)
c)
d)

21) The total number of ions produced when one molecule of [Co(NH3)6]Cl3 undergoes ionisation is
a) 1
b) 2
c) 3
d) 4

22) Complexation is shown by
a) Ag
b) Au
c) Cu
d) All

23) Ionisation of K[Ag(CN)2] will give
a)
b) KCN and AgCN
c)
d) None

24) Turnbulls blue is
a) Ferricyanide
b) Ferrous ferricyanide
c) Ferrous cyanide
d) Ferri-ferrocyanide

25) The probable formula for Prussian blue is
a)
b)
c)
d)

26) In which solvent will AgBr have highest solubility ?
a)
b)
c) Pure water
d)

27) Which of the following is not true for a ligand-metal complex ?
a) The larger the ligand, the more stable is the metal-ligand complex
b) A highly charged ligand forms stronger bonds
c) The larger the permanent dipole moment of the ligand, the more stable is the bond
d) The greater the ionisation potential of the central metal, the stronger the bond

28) In haemoglobin the iron is in the following oxidation state:
a) +2
b) +3
c) +1
d) +4

29) The oxidation state of Ni in the [Ni(CN)4]2- ion is
a) -2
b) +2
c) +4
d) 0

30) The oxidation number of nickel in K2[Ni(CN)4] is
a) -2
b) +2
c) -1
d) 0

31) The hybridisation of Mn in hexacyano-manganate (II) is sp3d2. The number of unpaired electrons in it is
a) 1
b) 2
c) 5
d) 3

32) The compound which does not show paramagnetism is
a)
b)
c)
d)

33) The EAN of Cr (Z = 24) in [Cr(NH3)6]Cl2 is
a) 35
b) 36
c) 27
d) 34

34) Prussian blue is formed when
a)
b)
c)
d)

35) Ligands in a complex salt are
a) Anions linked by co-ordinate bonds to a central metal atom or ion
b) Cations linked by co-ordinate bonds to a central metal atom or ion
c) Molecules linked by co-ordinate bonds to a Central metal or ion
d) Ions or molecules linked by co-ordinate bonds to a central atom or ion

36) The co-ordination number of chromium in the complex [Cr(NH3)2(H2O)2]Cl3 is
a) 4
b) 6
c) 2
d) 3

37) Which of the following is a monodentate ligand ?
a)
b)
c)
d) All the above

38) Which of the following act as catalysts ?
a)
b)
c)
d) Both (a) and (b)

39) The formation of a complex compound can be detected by the
a) Change in colour
b) Change in solubility
c) Change in pH
d) All are correct

40) Which of the following is not correct in the case of [Co(NH3)6]3+ complex ?
a) It is octahedral in shape
b)
c) It is diamagnetic
d) All are correct

41) Which of the following is not correct in the case of [Ni(CN)4]2- complex ?
a)
b) It has square planar shape
c) It is diamagnetic
d) All are correct

42) Which is not correct in the case of [Cu(NH3)4]2+ complex ?
a)
b) Paramagnetic
c) Square planar
d) All are correct

43) Which of the following is correct in the case of [NiCl4]2- complex ?
a)
b) Paramagnetic
c) Tetrahedral
d) All are correct

44) Which is correct in the case of [Fe(CN)6]4- complex ?
a) Diamagnetic
b) Octahedral
c)
d) All are correct

45) Which is correct in the case of [Fe(CN)6]3- complex ?
a)
b) Paramagnetic
c) One unpaired electron
d) All are correct

46) The shape of [Cu(NH3)4]2+ is square planar. Cu in this complex is
a)
b)
c)
d)

47) The oxidation state of Ag in Tollens reagent is
a) +1
b) -1
c) 0
d) +2

48) The magnetic behaviour of the complexes K4[Fe(CN)6] and K3[Fe(CN)6] is respectively
a) Paramagnetic, diamagnetic
b) Diamagnetic, paramagnetic
c) Diamagnetic, ferromagnetic
d) Diamagnetic

49) The stability constants of some reactions are given below. Predict which of the ligands is strongest.
a)
b)
c)
d)

50) The planar complex (MABCD) gives
a) Two geometrical isomers
b) Two optical isomers
c) Three geometrical isomers
d) None

51) The effective atomic number of Fe (Z = 26) in Fe (CO)5 is
a) 26
b) 34
c) 54
d) 36

52) Which of the following complexes have tetrahedral shape (sp3 hybridisation of central atom) ?
a)
b)
c)
d) All are correct

53) Which of the following complexes have octahedral shape due to sp3 d2 hybridisation of the central atom ?
a)
b)
c)
d) All are correct

54) Which of the following complexes has a square planar shape due to dsp2 hybridisation ?
a)
b)
c)
d) All are correct

55) Which of the following is a complex ?
a) Trimethyl aluminium
b) Ferrocene
c) Diethyl zinc
d) Nickel carbonyl

56) The formula of ferrocene is
a)
b)
c)
d)

57) The number of precipitable halide ions [Pt(NH3)CI2Br]Cl is
a) 2
b) 3
c) 4
d) 1

58) EDTA is
a) 3-co-ordinate
b) 2-co-ordinate
c) 4-co-ordinate
d) 6-co-ordinate

59) The co-ordination number of cobalt in Co(en)2Br2]Cl2 is
a) 2
b) 4
c) 6
d) 8

60) A blue solution of CuSO4 becomes darker when treated with ammonia solution, because
a) the ammonia molecule replaces the water molecule in solution
b) Ammonia is a stronger ligand than water
c) Ammonia forms a stable complex
d) None of these

61) Potassium hexacyanoferrate (II) is the compound
a)
b)
c)
d)

62) The formula of ruthenium carbonyl is
a)
b)
c)
d)

63) Which of the following shows only the co-ordination number 4 in complexes ?
a)
b)
c)
d)

64) Which of the following shows only the co-ordination number 6 ?
a)
b)
c)
d) All are correct

65) Which of the following statements about the coordination number of a cation is true ?
a) Most metal ions exhibit only a single characteristic co-ordination number
b) The co-ordination number is equal to the number of ligands bonded to the metal atom
c) For most cations, the co-ordination number depends on the size, structure and charge of the ligands
d) None of these

66) For which of the following transition metal ions are low spin complexes possible ?
a)
b)
c)
d) All are correct

67) Which of the following cations forms an acidic aqueous solution ?
a)
b)
c)
d) All are correct.

68) Which of the following ions produces a small crystal field splitting (a weak ligand field) ?
a)
b)
c)
d) All are correct

69) Which of the following ligands produce a high crystal field splitting (a strong ligand field) ?
a) CO
b)
c)
d) All are correct

70) Complexes with halide ligands are generally
a) High spin complexes
b) Low spin complexes
c) Both
d) None

71) Complexes with CN ligands are usually
a) High spin complexes
b) Low spin complexes
c) Both
d) None

72) The tetrahedral crystal field splitting is only ____ of the octahedral splitting
a) 1/9
b) 2/9
c) 4/9
d) 5/9

73) The effective atomic rule is less likely to apply if the metal – ligand bond
a) Is extremely weak
b) Has a covalent character
c) Has a large tendency towards ionic character
d) None is correct

74) Which of the following orders is correct for the spectrochemical series of ligands ?
a)
b)
c)
d)

75) Which of the following is a low spin complex ?
a)
b)
c)
d) All are correct

76) Which of the following is a high spin complex ?
a)
b)
c)
d) All are correct

77) The hybridisation of Cr in [Cr(H2O)6]3+ is
a)
b)
c)
d)

78) Which one of the following octahedral complexes is diamagnetic ?
a)
b)
c)
d)

79) Metal carbonyls are organo metallic compounds in which carbon monoxide acts as the ligand. The metal-carbon bond in metal carbonyls possesses both sigma and pi character. Which of the following metal carbonyls is diamagnetic and has tetrahedral geometry ?
a)
b)
c)
d)

80) A cobaltamine has the formula Co(NH3)6 Cl3. With AgNO3 solution, one third of the chloride is precipitated. The complex shows cis – trans isomerism. It can have the structure :
a)
b)
c)
d)

81) The colour of an aqueous solution of CrCl3 varies from violet to green depending upon concentration. This variation is due to the formation of
a)
b)
c)
d) All of these

82) Which of the following ions gives no change when aqueous alkali is added dropwise ?
a)
b)
c)
d)

83) A ligand is essentially a Lewis base. Which one of the following is a polydentate ligand ?
a)
b) CO
c)
d) E.D.T.A

84) In complexes, the ligands are linked to the central metal atom or ion by
a) Dative bonds
b) Ionic bonds
c) H-bonds
d) van der Waals forces

85) Which one of the following complexes is not linear ?
a)
b)
c)
d)

86) A hydrate of Cr, Cr(H2O)6 Cl3 , gives 3 moles of AgCl when treated with excess solution. Its structure is
a)
b)
c)
d)

87) Octahedral complex (C.N = 6) shows cis-trans isomerism if they are of the type
a)
b)
c)
d)

88) A typical example of a sandwiched compound is
a) Ferrocene
b)
c)
d)

89) Wilkinsons catalyst is
a)
b) Used in the hydrogenation of alkenes
c) a homogeneous catalyst
d) All the above

90) The ultimate product formed by hydrated iron (III) ions in an aqueous solution of pH= 5 is
a)
b)
c)
d)

91) Which one of the following salts does not produce a complex ion M(H2O)2+6 when dissolved in excess of water ?
a)
b)
c)
d)

92) In which of the following ions is the transition metal not exhibiting its highest common oxidation state ?
a)
b)
c)
d)

93) Ferrocene is an example of
a) a sandwiched complex
b) A pi-bonded complex
c) A complex in which all the five carbon atoms of cyclopentadiene anion are bound to the metal
d) All the above

94) Which one of the following is not a sigma bonded complex ?
a)
b)
c) n-butyllithium
d) Dibenzene chromium

95) Which of the following is not an organometallic compound ?
a)
b)
c)
d) All are correct

96) Geometrical isomerism is not possible in
a)
b)
c) MABCD
d) All

97) Haemoglobin is the complex of
a)
b)
c)
d)

98) Chlorophyll is the complex of
a)
b)
c)
d)

99) The oxidation state of the ligand in a complex is
a) Zero
b) Green
c) Always positive
d) Zero or negative

100) The stability of a complex depends on the
a) Basicity of the ligands
b) Charge on the central metal ion
c) Both (a) and (b)
d) None


Answer

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