What is the magnetic moment value of Fe2+ ion in [Fe(CN)6]4- ? f

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 Multiple Choice QuestionsMultiple Choice Questions

111.

In which of the following complex compounds the oxidation number of the metal is zero?

  • [Pt(NH3)2Cl2]

  • [Cr(CO)6]

  • [Cr(NH3)3Cl3]

  • [Cr(en)2Cl2]


112.

Formula of hexaaqua manganese (II) phosphate is

  • [Mn(H2O)]6PO4

  • [Mn(H2O)6]3PO4

  • [Mn(H2O)6]3(PO4)2

  • [Mn(H2O)6](PO4)3


113.

The correct IUPAC name of [Pt(NH3)3Br(NO2)Cl]Cl is

  • triammine chlorobromonitroplatinum (IV) chloride

  • triamminebromochloronitroplatinate (IV) chloride

  • triamminebromochloronitroplatinum (IV) chloride

  • triamminebromochloronitroplatinum (II) chloride


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114.

What is the magnetic moment value of Fe2+ ion in [Fe(CN)6]4- ?

  • 0

  • 3

  • 24

  • 8


C.

24

Let the oxidation state of Fe be x in [Fe(CN)6]4-

x + (-1)6 = -4

x = -4 + 6 = +2

Fe(26) = [Ar] 3d6 4s2

   Fe2+ = [Ar] 3d6

i.e. n = 4

We know that, magnetic moment, 

μ = n (n + 2)

   = 4 (4 + 2)

   = 24


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115.

The coordination number and oxidation state of Cr in K3[Cr(C2O4)3] are respectively  

  • 6 and +3

  • 3 and 0

  • 4 and +2

  • 3 and +3


116.

Which of the following complexes is an outer orbital complex?

  • [Co(NH3)6]3+

  • [Fe(CN)6]4-

  • [Ni(NH3)6]2+

  • [Mn(CN)6]4-


117.

IUPAC name for the complex compound K3[Fe(CN6)] is

  • Potassium hexacyanoferrate [II]

  • Potassium cynohexaferrate [II]

  • Potassium hexaoyanoferrate [Ill]

  • Potassium ferrocyanide iron [III]


118.

Give the increasing order of stability in the following complexes ions 

[AlF6]3-A [Cd(CN)4]2-B [Ag(CN)2]-C [Zn(CN)4]2-D

  • D < C < B < A

  • A < D < B < C

  • A < B < C < D

  • None of these


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119.

The correct representation of a complex ion is

  • [Co(H2O)(NH3)4Cl]2+

  • [CoCl(H2O)(NH3)4]2+

  • [Co(NH3)4Cl(H2O)]2+

  • [Co(NH3)4(H2O)Cl]2+


120.

What is the value of x on the [Ni(CN)4]x complex ion?

  • +2

  • -2

  • 0 (zero)

  • +4


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