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Coordination Compounds Test - 6

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Coordination Compounds Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0

    In [Fe(F6)]-4 ion, which of the following statements is incorrect?

    Solution

    F- is a weak field ligand and therefore no pairing of the d-electrons takes place.
    Hence, the Fe atom in [Fe(F6)]-4 ion is sp3d2 hybridised and it is an octahedral outer sphere complex ion.
    It is paramagnetic with magnetic moment = 4.9 B.M.

     

  • Question 2
    1 / -0

    Which of the following complexes is diamagnetic in nature?

    Solution

    CN- being a strong field ligand causes pairing of electrons.
    [Ni(CN)4]2- does not possess unpaired electrons and is diamagnetic.

     

  • Question 3
    1 / -0

    Which of the following orders of ligands in spectrochemical series is correct?

    Solution

    The order is SCN– < F– < CN–.

     

  • Question 4
    1 / -0

    The correct order for the wavelengths of absorption of the complexes of nickel in the visible region is

    Solution

    The order of the ligands in terms of splitting caused by them (Spectrochemical series) is H2O < NH3 < NO2.
    Greater the octahedral splitting, higher will be the energy barrier created for the electrons showing the d-d transitions, and shorter the wavelength of the light adsorbed.
    The correct order of the wavelengths of absorption of complexes of nickel in the visible region is [Ni(NO2)6]4- < [Ni(NH3)6]2+ < [Ni(H2O)6]2+.

     

  • Question 5
    1 / -0

    Which of the following compounds is not coloured?

    Solution

    Na2CdCl4 is not coloured. In Na2CdCl4, Cd2+ has d10 configuration. So, no d-d transtion is possible.

     

  • Question 6
    1 / -0

    The colour of [Ti(H2O)6]3+ ion is due to

    Solution

    [Ti(H2O)6]3+ is a d1 complex and the electron occupies the lowest energy orbital available, i.e. one of the three degenerate t2g orbitals. The purple colour is the result of the absorption of light, which results in the d-d transition of t2g electron into the eg level.

     

  • Question 7
    1 / -0

    Which of the following compounds is not an example of the main group organo-metallics?

    Solution

    Zeise's salt contains platinum as central metal ion which is a d-block element. This compound is an example of d-block organo-metallic compounds.

     

  • Question 8
    1 / -0

    The hypothetical complex chlorodiaquatriamminecobalt (III) chloride can be represented as

    Solution

    The hypothetical complex chlorodiaquatriamminecobalt (III) chloride can be represented as [CoCl(NH3)3(H2O)2]Cl2.
    Note: Since two Cl- ions are present as counter ions per molecule of the complex, the net charge on the complex is +2.
    Let the O.S of Co = x,
    O.S of Cl atom= -1

    H2O and NH3 are neutral ligands..
    Therefore,
    x + (-1) = +2
    x = +3

     

  • Question 9
    1 / -0

    Directions For Questions

    The following question has four choices, out of which only one is correct.

    Wilkinson's catalyst is a chemical used for the hydrogenation of alkenes. Other applications of the Wilkinson's catalyst include the catalytic hydroboration of alkenes with catecholborane and pinacolborane and the selective 1,4-reduction of α,β-unsaturated carbonyl compounds along with triethylsilane.

    ...view full instructions

    The catalyst discussed here can be referred to as a

    Solution

    Wilkinson's catalyst, ChloridotristriphenylphosphineRhodium(I), has the formula [RhCl(PPh3)3]. It has metal ions in +1 oxidation state. By combining the d-electrons of the metal (8) and those donated by the ligands (8), it has 16 electrons in the valence shell and is a 16-electron complex.

     

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