Co-ordination Compounds MCQs – 4

1) [Pt(NH3)4Cl2]Br2 and [Pt(NH3)4Br2]Cl2 are related as
a) Optecal isomers
b) Ionisation isomers
c) Linkage isomers
d) Co-ordination isomers

2) Which of the following is different from others ?
a) Pot. ferrocyanide
b) Ferrous amm. sulphate
c) Pot. ferricyanide
d) Tetramine copper (II) sulphate

3) Generally, a group of atoms can act as a ligand if
a) They are positively charged
b) They are free radicals
c) They are neutral molecules or negatively charged
d) None of these

4) The co-ordination number of the metal in a co-ordination compound is
a) Equivalent to the primary valency
b) Equivalent to the sum of the primary and secondary valencies
c) Equivalent to the secondary valency
d) None

5) Which of the following will give a precipitate with AgNO3 ?
a)
b)
c)
d)

6) The square planar complex K2[PdClBr2(SCN)] is expected to have —— isomers.
a) 2
b) 3
c) 4
d) 6

7) The IUPAC name of [Co(NH3)3(H2O)2Cl]Cl2 is
a) Diaqua chlorodiamine cobalt (III) chloride
b) Triamine diaquachlorocobalt (III) chloride
c) Chlorodiamine diaquachloro cobalt (III) chloride
d) Diamine diaquachlorocobalt (III) chloride

8) The co-ordination number of Ni in sodium diethylenediamine tetraacetatonickilate (II) is
a) 2
b) 4
c) 6
d) 3

9) When a diamagnetic substance is placed in a magnetic field then it indicates
a) An increase in weight
b) a decrease in weight
c) No change in weight
d) None

10) In the formation of a complex, the transition metal cation
a) Gives an electron pair
b) Accepts an electron pair
c) Gives or accepts an electron pair
d) Forms a hydrogen bond with the ligand

11) [Co(NH3)5Br]SO4 and [Co(NH3)5SO4 ]Br exhibit
a) Hydrate isomerism
b) lonisation isomerism
c) Ligand isomerism
d) Co-ordination isomerism

12) The magnetic moment of [Ag(CN)2] is zero. The number of unpaired electrons in it is
a) 1
b) 2
c) 3
d) 0

13) [Co(NH3)4Cl2]NO2 and [Co(NH3)4Cl.NO2]Cl are
a) Geometrical isomers
b) Optical isomers
c) Linkage isomers
d) lonisation isomers

14) The co-ordination number of Cu in [Cu(H2O)4]2+ is
a) 4
b) 3
c) 2
d) 1

15) The complex [Pt(NH3)6 ]Cl4 will give after ionisation
a) 5 ions
b) 4 ions
c) 3 ions
d) 2 ions

16) The two complexes given below are.


a) Geometrical isomers
b) Position isomers
c) Optical isomers
d) Identical

17) The following complex can exhibit


a) Optical isomers only
b) Geometrical isomerism only
c) Both optical and geometrical isomerism
d) None

18) The exchange of the co-ordination group for a water molecule in a complex molecule results in
a) lonisation isomerism
b) Ligand isomerism
c) Hydration isomerism
d) Geometrical isomerism

19) The primary valency of Fe in K3[Fe(CN)6] is
a) 3
b) 2
c) 1
d) 0

20) The complex [Co(NH3)3Cl3] when dissolved in water gives
a) 4 ions
b) 3 ions
c) Two ions
d) No ions

21) The donor atoms in EDTA are
a) Two N and two O
b) Two N and four O
c) Four N and two O
d) three N and three O

22) Which of the following ligands is not a chelating agent ?
a) EDTA
b) en
c) Oxalate
d) Pyridine

23) The co-ordination number of platinum in the complex [Pt(NH3)4CI2] CI2 is
a) 2
b) 4
c) 6
d) 8

24) The co-ordination number of Cr in the complexion [Cr(H2O)6]3+ is
a) Zero
b) 3
c) 6
d) None of these

25) The oxidation number of copper in the complex [Cu (NH3)4] SO4 is
a) 2
b) 4
c) 6
d) 1

26) The oxidation number of nickel in the complex [Ni (CO)4] is
a) 4
b) 2
c) Zero
d) None of these

27) The oxidation number of Fe in K3 [Fe(CN)6] is
a) 2
b) 3
c) 4
d) 6

28) The oxidation number of platinum in [Pt(NH3)5 Cl] CI3 is
a) 2
b) 3
c) 4
d) 6

29) An ambidentate ligand is one which
a) is linked to the metal atom at two points
b) Has two donor atoms but only one of them has the capacity to form a coordinate bond
c) Has two donor atoms but either of the two can form a co-ordinate bond
d) Forms chelate rings

30) The correct name for the complex [CrCI2 (H2O)4] NO3 is
a) Dichlorotetraaqueouschromium(lll) nitrate
b) Tetraaquodichlorochromate (III) nitrate
c) Dichlorotetraaqueouschromium(IV) nitrate
d) Tetraaquadichlorochromium(lll) nitrate

31) The correct name for the complex K3 [Fe(C2O4)3] is
a) Potassium ferric oxalate
b) Potassium iron (III) trioxalate
c) Potassium trioxalato iron (III)
d) Potassium trioxalatoferrate (III)

32) The correct name for the complex [Pt (NH3)2 CI4] is
a) Platinum diamine tetrachloride
b) Platinum tetrachlorodiamine
c) Tetrachlorodiamine platinate (IV)
d) Diaminetetrachloro platinum (IV)

33) The correct name for the complex ion [Co(en)2CI(ONO)]+ is
a) Cobalt diethylene diamine chloronitrate
b) Chlorodiethyldiaminenitrito cobalt (III)
c) Chloronitritodiethyldiamine cobalate (III)
d) Chlorobis(ethylenediamine)nitrito cobalt (III)

34) The correct name for the complex [Cr(NH3)6] [Co(C2O4)3] is
a) Hexaaminechromium(lll) trioxalatocobalt (III)
b) Hexaaminechromate(lll) trioxalatocobalate (III)
c) Hexaaminechromium(lll) trioxalatocobaltate (III)
d) Hexaaminechromate(lll) trioxalatocobalt (III)

35) The correct IUPAC name of Mn3 (CO)12 is
a) Dodecacarbonylmanganate (0)
b) Dodecacarbonylmanganic (II)
c) Dodecacarbonyl trimanganese (0)
d) Manganicdodecacarbonyl (0)

36) The correct IUPAC name of the complex Fe(C5H5)2 is
a) Cyclopentadienyl iron (II)
b) Bis (cyclopentadienyl) iron (II)
c) Dicyclopentadienyl ferrate (II)
d) Ferrocene

37) The correct formula of the complex tetraamineaquachlorocobalt (III) chloride is
a)
b)
c)
d)

38) Which of the following is a pair of ionization isomers ?
a)
b)
c)
d)

39) In coordination compounds, the hydrate isomers differ
a) In the number of water molecules of hydration only
b) In the number of water molecules only present as ligands
c) Both (a) and (b)
d) In their coordination number of the metal atom.

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

41) Which of the following complexes or the complex ions will show geometrical isomerism ?
a)
b)
c)
d)

42) Geometrical isomerism in coordination compounds is exhibited by
a) Square planar and tetrahedral complexes
b) Square planar and octahedral complexes
c) Tetrahedral and octahedral complexes
d) Square planar, tetrahedral and octahedral complexes

43) Which of the following is not optically active ?
a)
b)
c)
d)

44) Which of the following complex ions will not show optical activity ?
a)
b)
c)
d)

45) The first important theory of coordination compounds was put forward by
a) Slater
b) Pauling
c) Werner
d) Lewis

46) Which one of the following statements is incorrect about Werners theory ?
a) The primary valency is the same thing as the oxidation state
b) The secondary valency is the same thing as the coordination number
c) Secondary valencies are satisfied by negative ions
d) Secondary valencies are directional whereas primary valencies are non-directional

47) The number of ions produced from one molecule of [Pt (NH3)5 Cl] CI3 in the aqueous solution will be
a) 3
b) 4
c) 5
d) 6

48) The shape of the complex [Ni (CO)4] is
a) Square planar
b) Tetrahedral
c) Octahedral
d) None of these

49) The complex ion [Cu (NH3)4]2+ is
a) Tetrahedral and paramagnetic
b) Tetrahedral and diamagnetic
c) Square planar and paramagnetic
d) Square planar and diamagnetic

50) The complex ions [Fe(CN)6]3- and [Fe(CN)6]4-
a) Are both octahedral and paramagnetic
b) Are both octahedral and diamagnetic
c) Have the same structure but opposite magnetic character
d) Have different structures but the same magnetic character

51) The hybridization involved in [Ni(CO)4] is
a)
b)
c)
d)

52) Which one of the following complexes or ions is paramagnetic ?
a)
b)
c)
d)

53) Which of the following contains one unpaired electron in the 4p orbitals ?
a)
b)
c)
d)

54) Which of the following is an outer orbital complex ?
a)
b)
c)
d)

55) Which of the following complexes has a shape different from others ?
a)
b)
c)
d)

56) Which of the following complexes has the least molar conductivity in the solution ?
a)
b)
c)
d)

57) The complex CoCI3. 5 NH3 in aqueous solution ionizes to give a total number of ions equal to
a) 0
b) 2
c) 3
d) 4

58) Which one of the following statements is incorrect?
a) The greater the stability constant of a complex ion, the greater is its stability
b) The greater the charge on the central metal ion, the greater is the stability of the complex
c) The greater is the basic character of the ligand, the greater is the stability of the complex
d) Chelate complexes have low stability constants

59) The stability constants of the complexes formed by a metal ion (M2+) with NH3, , H2O and V/en are of the order 1011, 1027, 1015 and 108 respectively. Then
a) en is the strongest ligand
b)
c) These values cannot predict the strength of the ligand
d) All ligands are equally strong

60) EDTA is used for the estimation of
a)
b)
c)
d)

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

62) The cyanide method is used for the extraction of
a) Gold
b) Copper
c) Nickel
d) Calcium

63) cis-Platin used for the treatment of cancer is
a)
b)
c)
d)

64) Which one of the following is not an organometallic compound ?
a)
b)
c)
d)

65) Wilkinsons catalyst, (Ph3P)3 RhCI is used for
a) Hydrogenation of oils
b) Hydrogenation of alkynes
c) Hydrogenation of alkenes
d) Polymerisation of alkenes

66) Zeigler-Natta catalyst (trialkylaluminium +TiCI4) is used for the
a) Synthesis of methanol
b) Polymerisation of olefins
c) Cracking of hydrocarbons
d) Hydrogenation of olefins

67) The brown ring complex compound is formulated as [Fe (H2O)5 (NO)2+] SO4 ; the oxidation state of iron is
a) 1
b) 2
c) 3
d) 0

68) 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

69) A solution of potassium ferrocyanide would contain …….. ions
a) 2
b) 3
c) 4
d) 5

70) The coordination number of copper in cuprammonium sulphate is
a) 2
b) 3
c) 4
d) 6

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

72) Which of the following ligands is a bidentate ?
a) EDTA
b) Ethylenediamine
c) Acetate
d) Pyridine

73) The complex CoCI3. 3 NH3 ionizes to give
a)
b)
c)
d)

74) Amongst Ni (CO)4, [Ni (CN)4]2- and NiCI.
a)
b)
c)
d)

75) The possible number of isomers for the complex [MCI2 . Br2] SO4 is :
a) 1
b) 2
c) 4
d) 5

76) Ligands in a complex salt are
a) Anions linked by coordinate bonds to a central metal ion
b) Cations linked by coordinate bonds to a central metal ion
c) Molecules linked by coordinate bonds to a central metal ion
d) Ions or molecules linked by coordinate bonds to a central metal ion

77) In any ferric salt, on adding potassium ferrocyanide a Prussian blue colour is obtained which is due to the formation of
a)
b)
c)
d)

78) The compound which does not show paramagnetism is
a)
b)
c) NO
d)

79) [Co (NH3)5 Br] SO4 and [Co (NH3)5 SO4]Br are examples of which type of isomerism ?
a) Linkage
b) Geometrical
c) lonisation
d) Optical

80) Which of the following shows outer orbital hybridization ?
a)
b)
c)
d)

81) The oxidation number of Pt in [Pt (C2H4) CI3] is
a) + 1
b) + 2
c) + 3
d) +4

82) Amongst the following ions which one has the highest paramagnetism ?
a)
b)
c)
d)

83) The effective atomic number of Cr (atomic no. 24) in [Cr (NH3)6] CI3 is
a) 35
b) 27
c) 33
d) 36

84) The number of d-electrons in [Cr(H2O)6]3+ [At. No. of Cr = 24] is
a) 2
b) 3
c) 4
d) 5

85) [Co (NH3)4 CI2] NO2 and . [Co (NH3)4 CINO2] Cl exhibit which type of isomerism ?
a) Geometrical
b) Optical
c) Linkage
d) lonisation

86) Hypo is used in photography because it is a
a) Strong oxidising agent
b) Strong reducing agent
c) Strong complexing agent
d) None of the above

87) Turnbulls blue is
a) Ferricyanide
b) Ferrous ferrocyanide
c) Ferrous cyanide
d) Ferriferrocyanide

88) Ammonia will not form complex ions with
a)
b)
c)
d)

89) The characteristic oxidation number of the atoms in free metals is
a) Minus one
b) One
c) Any number
d) Zero

90) Q@ The above complex is obtained by
a)
b)
c)
d)

91) The oxidation state of copper in the above complex is
a) 0
b) 1
c) 2
d) 4

92) The colour of [Cu (NH3)4]2+ complex is
a) Blue
b) Green
c) Red
d) Violet

93) K3[AI(C2O4)3] is called
a) Potassium alumino oxalate
b) Potassiumtrioxalatoaluminate (III)
c) Potassium aluminium (III) oxalate
d) Potassium trioxalato aluminate (VI)

94) Among the following complexes, optical activity is possible in
a)
b)
c)
d)

95) Which of the following is a complex salt
a) Fischer salt
b)
c)
d) Micro cosmic salt

96) When AgCI dissolves in ammonia solution it forms a complex with NH3 having the structure :
a)
b)
c)
d)

97) The blue complex formed on addition of conc.NH4OH solution to a Cu2+ salt solution has the structure
a)
b)
c)
d)

98) The hybridization state of Fe in

[Fe (H2O)5 NO] SO4 is (At. No. of Fe = 26)
a)
b)
c)
d)

99) The formula of sodium nitroprusside is
a)
b)
c)
d)

100) Which of the following is square planar (At. No of Ni = 28) ?
a)
b)
c)
d)


Answer

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