Coordination Compounds

Short Answer Type

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[Fe(CN)6]4- and [Fe(H2O)6]2+ are of different colours in dilute solutions. Why?

Some of the visible spectrum is being removed from white light as it passes through the sample, so the light that emerges is no longer white. The colour of the complex is complementary to that which is absorbed. The complementary colour is the colour generated from the wavelength left over. If green light is absorbed by the complex, it appears red. Therefore, [Fe(CN)6]4- and [Fe(H2O)62+ are of different colours in dilute solutions.
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    Specify the oxidation numbers of the metals in the following coordination entities:
     [Co(H2O)(CN)(en)2]2+
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    Out of the following two coordination entities which is chiral (optically active)?
    (a)    cis-[CrCl2(ox)2]3+
    (b)    [trans-[CrCl2 (ox)2]3–

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    Write the IUPAC names of the following coordination compounds:

    (i) [Pt(NH3)2Cl(NO2)]
    (ii) K    3[Cr(C2O4)3]            
    (iii) [CoCl    2(en)2]Cl
    (iv) [Co(NH    3)5(CO3)]Cl          
     (v) Hg[Co(SCN)    4]
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    Write the formulas for the following coordination compounds:

    (i) Tetraamine aqua chlorocobalt(III) chloride.
    (ii) Potassium tetrahydroxozincate(II).
    (iii) Potassium trioxalatoaluminate(III).
    (iv) Dichloridobis (ethane-1, 2-diamine) cobalt(III) chloride.
    (v) Tetracarbonyl nickel (0)
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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+?

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    Explain the bonding in coordination compounds in terms of Werner’s postulates.
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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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    Short Answer Type

    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

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