A solution of [Ni (H2O)6]2+ is green but a solution of
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    Coordination Compounds

    Multiple Choice QuestionsShort Answer Type

    131. 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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    132. 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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    133.

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

    Ni(CN)42– has no unpaired electron in its d sub shell and thus d - d transition is not possible whereas Ni(H2O)62+ has compaired electron in its d-subshell which give rise to d - d transition to impart colour.
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    134. [Fe(CN)6]4- and [Fe(H2O)6]2+ are of different colours in dilute solutions. Why?
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    135.

    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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    136.

    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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    137. Explain the bonding in coordination compounds in terms of Werner’s postulates.
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    Multiple Choice QuestionsLong Answer Type

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

    140. Specify the oxidation numbers of the metals in the following coordination entities:
     [Co(H2O)(CN)(en)2]2+
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