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Coordination Compounds Test - 13

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Coordination Compounds Test - 13
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  • Question 1
    1 / -0

    Which of the following compounds is most likely to be coloured?

    Solution

    1. 22Ti4+ E.C. = 3d0 4s0 - colourless
    2. 29Cu+ E.C. = 3d10 4s0 - colourless
    3. 24Cr3+ E.C. = 3d3 4s0 - coloured (Violet)
    4. 22Ti4+ E.C. = 3d0 4s0 - colourless

     

  • Question 2
    1 / -0

    Find the value of 'x' in a coordination compound Kx[Cu(CN)4], which is formed by the addition of excess of KCN to the aqueous solution of copper sulphate.

    Solution

    2KCN + CuSO4 → Cu(CN)2 + K2SO4

    2Cu(CN)2 → Cu2(CN)2 + 2(CN)
    (unstable)

    Cu2(CN)2 + 6KCN →2K3[Cu(CN)4]

    The compound at the end is the final product, which is is potassium tetracyanocuprate(I).

     

  • Question 3
    1 / -0

    Which of the following is used as an antidote for lead poisoning?

    Solution

    For the treatment of lead poisoning, doctors use antidotes like D-penitsilamin, dimercaprol, ethylenediaminetetraacetic acid and tincture of iodine.
    Ethylenediamminetetraacetate ion (EDTA) is a hexadentate ligand and forms a soluble complex with lead and is prescribed to remove lead poisoning.

     

  • Question 4
    1 / -0

    Select the correct order of initials T (True) and F (False) for the following statements:

    (I) Co(II) is stablised in the presence of strong field ligands, while Co(III) is stablised in the presence of weak field ligands.
    (II) [Cr(NH3)6]3+ is an inner orbital complex with crystal field stablisation energy equal to -1.2 Δo.
    (III) In [CoF6]3-, F- is a weak field ligand so that Δo < P and it is a low spin complex.
    (IV) Crystal field splitting in ferrocyanide ion is greater than that in ferricyanide ion.

    Solution

    (I) Both Co2+ and Co3+ are stablised in the presence of strong field ligands due to higher CFSE values.
    (II) It is a correct statement.
    (III) In [CoF6]3-,Δo < P; thus it is a high spin complex.
    (IV) The greater the charge on the central atom, the greater will be the splitting.

     

  • Question 5
    1 / -0

    For which of the following configurations is the value of spin only magnetic moment 2.84 BM?

    Solution

    The magnetic moment value of 2.84 BM indicates the presence of 2 unpaired electrons.
    d4 (in strong field ligand) will have configuration t2g4 eg 0with 2 unpaired electrons.

     

  • Question 6
    1 / -0

    On the basis of the valence bond theory, which one of the following species will not have the same geometry as of other three?

    Solution

    The complex [Ni(CN)4]2– has square planar geometry with dsp2 hybridisation.
    In all the other options, Ni+2 is sp3 hybridised with tetrahedral geometry.

     

  • Question 7
    1 / -0

    The molecular composition of a complex salt is [Co(NO2)(SCN)(en)2]Br. Which of the following types of isomerism is shown by this complex salt?

    Solution

    [Co(NO2)(SCN)(en)2]Br is an octahedral complex of type [Mxy(aa)2]. This type of octahedral complex shows geometrical isomerism.

     

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