Which of the following complexes has lowest molar conductance? f

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 Multiple Choice QuestionsMultiple Choice Questions

71.

 The IUPAC name of [Ni(PPh3)2Cl2]2+ is:

  • bis dichloro (triphenylphosphine) nickel (II)

  • dichloro bis (triphenylphosphine) nickel (II)

  • dichloro triphenylphosphine nickel (II)

  • triphenyl phosphine nickel (II) dichloride


72.

Which of the following does not contain any coordinate bond?

  • H3O+

  • BF4-

  • HF2-

  • NH4+


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73.

Which of the following complexes has lowest molar conductance?

  • CoCl3·3NH3

  • CoCl3·4NH3

  • CoCl3·5NH3

  • CoCl3·6NH3


A.

CoCl3·3NH3

Molar conductance is the conducting power of all the ions produced by dissolving 1 g-mole of an electrolyte. Therefore, molar conductance ∝ number of ions produced.
Werner complex Modern-notation Ionisation
COCl3·3NH3 [Co(NH3)3Cl3] [Co(NH3)3Cl3] (No ionisation)
COCl3·4NH3 [Co(NH3)4Cl2]Cl  [Co(NH3)4Cl2]+ + Cl- (2 ions)
COCl3·5NH3 [Co(NH3)5Cl]Cl2  [Co(NH3)5Cl]2+ + 2Cl- (3 ions)
COCl·6NH3 [Co(NH3)]Cl3 [Co(NH3)6]3+ + 3Cl- (4ions)

From above table it is clear that, molar conduction of the complexs will be in the following order a <b <c <d.


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74.

Select the diamagnetic complex ion amongst the following complexes (At. no. : Fe = 26,CO = 27)

  • K3[Fe(CN)6]

  • [Co(NH3)6)Cl3

  • K3[FeF6]

  • K3[CoF6]


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75.

The correct charge on and co-ordination number of 'Fe' in K3[Fe(CN)6] is

  • +2, 4

  • +3, 6

  • +2, 6

  • +3, 3


76.

Which of the following co-ordinate complexes is an exception to EAN rule? (Given, atomic number Pt = 78, Fe = 26, Zn = 30, Cu = 29)

  • [Pt(NH3)6]4+

  • [Fe(CN)6]4-

  • [Zn(NH3)4]2+

  • [Cu(NH3)4]2+


77.

Consider the following two complex ions : [CoF6]3- and [Co(C2O4)3]3-. Which of the following statement(s) is/are false?

I. Both are octahedral.

II. [Co(C2O4)3]3- is diamagnetic while [CoF6]3- is paramagnetic.

III. Both are outer orbital complexes.

IV. In both the complexes, the central metal is in the same oxidation state.

  • Both II and III

  • II, III and IV

  • Only III

  • Both III and IV


78.

Chlorophyll is a coordination compound of

  • Iron

  • Magnesium

  • Manganese

  • Zinc


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79.

The hybridised state of Al3+ in the complex ion formed when AlCl3 is treated with aqueous acid is

  • sp3

  • dsp2

  • sp3d2

  • sp2d


80.

Which of the following is a neutral complex?

  • [Pt(NH3)2Cl2]

  • [Co(NH3)6]Cl3

  • [Ni(NH3)6]Cl2

  • K4[Fe(CN)6]


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