Coordination Compounds

Short Answer Type

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Which of the two is more stable K4[Fe(CN)6] or K3[Fe(CN)6].

In K4[Fe(CN)6] oxidation state of iron is +2.
where as in K3[Fe(CN)6] oxidation state is +3. Since both have strong field ligand therefore pairing occur. in case of +2 oxidation state all electron is paired such that the configuration is T2g6. But in case of +3 oxidation state the configuration is T2g5.Hence K3[Fe(CN)6] more stable because Fe3+ is smaller in size and has higher charge than Fe2+.
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    A coordination compound has the formula CoCl3.4NH3. It does not liberate NH3 but forms a precipitate of AgCl on treatment with AgNO3 solution. Write the structure and IUPAC name of the complex.

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    [Fe(CN)6]3– is weakly paramagnetic while [Fe(CNO)6]4– is diamagnetic, why?
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    Give two complexes which are used in medicines.

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    Write IUPAC name of K3[Fe(C2O4)3].

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    Write down the IUPAC names of the following compounds:

    (i) [CO(NH3)5ONO ]Cl2     
    (ii) K3[    Cr(CN)6]

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    Write the IUPAC name for  [Cr(NH3)5 CO3]Cl.

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    Explain why chelating complex is more stable than unchelated complex?

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    Draw cis- and trans-isomers of [Pt(NH3)2Cl2].

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    Give the name of a bidentate ligand.
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