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What is a coordination polyhedron ?...

What is a coordination polyhedron ?

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The spatial arrangement of the ligands which are directly bonded to the central atom or ions defines the geometry about the central atom is called co-ordination polyhedron
Eg. : Octahedral, tetrahedral etc.
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What is a coordination number?

Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.

Knowledge Check

  • What is/are the coordination number(s) of Au in the complexes formed by Au ?

    A
    6
    B
    4
    C
    5
    D
    2

  • Which of the following pairs show coordination isomerism ?

    A
    `[Co(NH_(3))_(6)][Cr(CN)_(6)]and[Cr(NH_(3))_(6)][Co(CN)_(6)]`
    B
    `[Co(NH_(3))_(3)(H_(2)O)_(2)Cl]Brand[Co(NH_(3))_(3)(H_(2)O)Cl.Br]Br.H_(2)O`
    C
    `[Pt(NH_(3))_(4)Cl_(2)]Br_(2)and[Pt(NH_(3))_(4)Br_(2)]Cl_(2)`
    D
    `[Co(NH_(3))_(6)][Cr(C_(2)O_(4))_(3)]and[Cr(NH_(3))_(6)][Co(C_(2)O_(4))_(3)]`

  • Which of the following contains a coordinate covalent bond ?

    A
    `H_(2)O`
    B
    `NH_(3)`
    C
    `NH_(4)^(+)`
    D
    `C_(2)H_(4)`

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