The complex ion which has the highest magnetic moment among the f

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 Multiple Choice QuestionsMultiple Choice Questions

81.

The correct statement with respect to the complexes [Ni(CO)4] and [Ni(CN)4]2- is

  • nickel is in the same oxidation state in both

  • both have tetrahedral geometry

  • both have square planar geometry

  • have tetrahedral and square planar geometry respectively


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82.

The complex ion which has the highest magnetic moment among the following is

  • [CoF6]3-

  • [Co(NH3)6]3+

  • [Ni(NH3)4]2+

  • [Ni(CN)4]2-


A.

[CoF6]3-

The complex ion which has the highest magnetic moment  is [CoF6]3-. In this ion, the oxidation state of cobalt is +3.

Co3+ ion-

Formation of [CoF6]3+

Here, F- ion provides a weak ligand field and is unable to pair up the unpaired electrons of the 3d-orbitals. Thus, it is highly paramagnetic.


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83.

When 0.01 mole of a cobalt complex is treated with excess silver nitrate solution, 4.305 g of silver chloride is precipitated. The formula of the complex is

  • [Co(NH3)3Cl3]

  • [Co(NH3)5Cl]Cl2

  • [Co(NH3)6]Cl3

  • [Co(NH3)4Cl2]NO


84.

Which among the following statements are true for the complex [Co(NH3)6][Cr(CN)6]?

1. It is a non-electrolyte
2. The magnitude of the charge on each complex ion is 3
3. The complex will not conduct current
4. The complex will exhibit coordination isomerism
5. The magnitude of the charge on each complex ion is 1

  • 2 and 4

  • 1 and 4

  • 3 and 5

  • 1 and 2


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85.

An example of ambidentate ligand is

  • thiocyanato

  • aquo

  • chloro

  • ammine


86.

The primary and secondary valencies of chromium in the complex ion, dichlorodioxalatochromium (III), are respectively

  • 3, 4

  • 4, 3

  • 3, 6

  • 6, 3


87.

(A) K4[Fe(CN)6]

(B) K3[Cr(CN)6]

(C) K3(Co(CN)6]

(D) K2(Ni(CN)4]

Select the complexes which are diamagnetic.

  • (A), (B) and (C)

  • (B), (C),and (D)

  • (A), (C) and (D)

  • (A), (B) and (D)


88.

Which is not true of the co-ordination compound [Co(en)2Cl2]Cl?

  • Exhibits geometrical isomerism

  • Exhibits optical isomerism

  • Exhibits ionisation isomerism

  • Is an octahedral complex


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89.

The molecular formula of potash alum is

  • KAl2S4H48O40

  • K2Al2S4H48O39

  • K2Al2S4H48O40

  • KAl2S4H48O40


90.

Aluminium reacts with NaOH and forms compound 'X'. If the coordination number of aluminiumin 'X' is 6, the correct formula of X is -

  • [Al(H2O)4(OH)2]+

  • [Al(H2O)3(OH)3]

  • [Al(H2O)2(OH)4]-

  • [Al(H2O)6](OH)3


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