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Explain: [Ni (CN)4]^(2-) is diamagnetic ...

Explain: `[Ni (CN)_4]^(2-)` is diamagnetic while `[Ni(Cl)_4]^(2-)` is paramagnetic.

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`[Ni(CO)_4` : Ni is in zero oxJdation state. Ni has outer `3d^8 4s^2` electronic configration.

The electrons of 4s-orbitals are forced into 3d - orbitals to pair up ·with the two unpaired d- electrons. Thus complex is diamagnetic. The complex has sp3 hybridisation. Therefore `[Ni(CO_4)]` has tetrahdral geometry.
`[PtCl_2(NH_3)_2]` : Platinum has outer electronic configuration `5d^9 6s^1. Pt^(2+)` ion has outter electronic configuration `5d^8`.


Therefore, complex is diamagnetic. The complex has square planar geometry due to `dsp^2` hybridisation.
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OMEGA PUBLICATION-CO-ORDINATION COMPOUNDS -MULTIPLE CHOICE QUESTIONS
  1. Explain: [Ni (CN)4]^(2-) is diamagnetic while [Ni(Cl)4]^(2-) is parama...

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  2. An example of double salt is

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  3. Write IUPAC name of [Co(NH3)6]Cl3.

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  4. Name of complex [pt(NH3)6]Cl4 is

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  5. [Co(NH3)5 Br]SO4 and [Co(NH3)5 SO4] Br areexamples of which type of i...

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  6. Which complex has square planar structure?

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  7. The number of d-electrons in [Cr(H2O)6]^(3+) (at. No. of Cr = 24 ) is

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  8. The oxidation number of iron in K4[Fe (CN)6] is :

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  9. The IUPAC name of [Co(Cl) (NO2) (en)2 ] Cl is

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  10. Which of the following complex species involves d^2sp^3 hybridisation ...

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  11. Which of the following acts as a positive ligand?

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  12. The co-ordination number of Cr in [Cr(NH3)3(H2O)3]Cl3 is

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  13. The magnetic moment of [Ni(CO4)] is

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  14. The effective atomic number of Cr (Atomic no. = 24) in [Cr (NH3)6]Cl3 ...

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  15. The effective atomic number of Fe in Fe(CO)5 is

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  16. The coordination number of copper in cuprammonium sulphate is

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  17. en is an example of a

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  18. Ferrocene is

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  19. Which of the following ligands is expected to be bidentate?

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  20. The number of unpaired electrons in the complexes [NiCl4]^(-2) and [Ni...

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  21. According to effective atomic number, the central metal acquires

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