Coordination Compounds

Short Answer Type

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What will be the correct order for the wavelength of absorption in the visible region for the following:
[Ni (NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6]2+?

The central metal atom is same in all compound. Thus adsorption in the visible reigon depend on the ligand. according to spectrochemical series increasing order of ligand is H2O < NH3 < NO2-. Hence the correct order for wavelength is 
[Ni (NO2)6]4–<[Ni(NH3)6]2+<[Ni(H2O)6]2+.

(i) [Ni– (NO2)6]4– = wavelength of light is 498 nm.
(ii) [Ni(NH3)6]2+= wavelength of light is 475 nm.
(iii) [Ni(H2O)6]2+ = wavelength of light is 500nm.

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    Write the IUPAC names of the following coordination compounds:

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     (v) Hg[Co(SCN)    4]
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    A solution of [Ni (H2O)6]2+ is green but a solution of [Ni(CN)4]2– is colourless. Explain. 

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    Long Answer Type

    What is meant by unidentate, didentate and ambidendate ligands ? Give two examples of each. 
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    Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic. 
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    Short Answer Type

    Specify the oxidation numbers of the metals in the following coordination entities:
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    Write the formulas for the following coordination compounds:

    (i) Tetraamine aqua chlorocobalt(III) chloride.
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    (v) Tetracarbonyl nickel (0)
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    Out of the following two coordination entities which is chiral (optically active)?
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    Explain the bonding in coordination compounds in terms of Werner’s postulates.
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