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61.
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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62.

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

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63.

Write IUPAC name of K₃[Fe(C₂O₄)₃].

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64.

Give two complexes which are used in medicines.

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65. [Fe(CN)₆]^3– is weakly paramagnetic while [Fe(CNO)₆]^4– is diamagnetic, why?

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66.

A coordination compound has the formula CoCl₃.4NH₃. It does not liberate NH₃but forms a precipitate of AgCl on treatment with AgNO₃ solution. Write the structure and IUPAC name of the complex.

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