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    Coordination Compounds

    Multiple Choice QuestionsShort Answer Type

    71. What is Wilkinson’s catalyst? Where is it used?
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    72.

    Write the IUPAC name of [Ni(CN)4]2– ion?

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    73. Nickel carbonyl( NiCO4) has tetrahedral geometry whereas [Pt(NH3)2Cl2] is square planar.
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    74.

    Write the expression for the stability’ constant for [Cu(NH3)4]2+.

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    75.

    The value of equilibrium constants of [Cu(NH3)4]+ and [Co(NH3)6]3+ are 1.0 x 10–12 and 6.2 x 10–36 respectively. Which complex would be more stable and why ?

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    76.

    In octahedral complexes which two d-orbitals are used in hybridization.

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    77.

    If the value of Δ0 is less than P in the crystal field, write the arrangement of d4coordination entity in crystal field split.

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    78.

    How is ammonia molecule  is a good ligand?

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    79.

    What do you understand by the term stability constant K for a complex?

    A stability constant (formation constant, binding constant) is an equilibrium constant for the formation of a complex in solution. It is a measure of the strength of the interaction between the reagents that come together to form the complex. There are two main kinds of complex: compounds formed by the interaction of a metal ion with a ligand and supramolecular complexes, such as host-guest complexes and complexes of anions. The stability constant provide the information required to calculate the concentration of the complex in solution.
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    80. There are two compounds [Cr(NH3)4]2+ and [Cr(CN)4]2– having 5.2 x 1011 and 3.2 x 1022 respectively as their K values, which complex is more stable and which ligand NH3or CN– is a stronger ligand?
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