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Coordination Compounds Test - 8

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Coordination Compounds Test - 8
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?

    Solution

    The complex involves d2sp3 hybridisation and is an inner orbital complex.

     

  • Question 2
    1 / -0

    The d-electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8, respectively. Which one of the following complexes will exhibit the minimum paramagnetic behaviour?

    Solution

    Water is a weak ligand, so [Ni(H2O)6]2+ and the 3d electrons will remain unpaired.
    Ni+2 is (3d8) will have two unpaired electrons ( t2g6, eg2)and hence, will show the least magnetic moment.

     

  • Question 3
    1 / -0

    Which of the following ions has the highest magnetic moment value?

    Solution

    [Cr(H2O)6]3+ : 3d3 : 3 unpaired electrons
    [Co(NH3)6]3+ : 3d6 : diamagnetic
    [Zn(H2O)6]2+ : 3d10 : diamagnetic
    [FeF6]3- : 3d5 : 5 unpaired electrons
    Magnetic moment is directly proportional to the number of unpaired electrons.

     

  • Question 4
    1 / -0

    The magnitude of crystal field stabilization energy is the highest for

    Solution

    The higher the oxidation state of the metal, the greater is the crystal field splitting. Out of the four options, [Co(NH3)6]3+ has the maximum oxidation state (+3) of the metal.

     

  • Question 5
    1 / -0

    Which of the following complex ions is expected to absorb visible light?
    [At. No. Zn = 30, Sc = 30, Sc = 21, Ti = 22, Cr = 24]

    Solution

    Oxidation states of metals and their electronic configurations in their complexes are:
    Zn2+ : [Ar]3d10
    Sc3+ : [Ar]3d0
    Ti4+ : [Ar]3d0
    Cr3+ : [Ar]3d3
    Complex ions having completely filled or empty d-orbitals are colourless. Hence, [Cr(NH3)6]3+ is coloured.

     

  • Question 6
    1 / -0

    Which among the following is a non-existent metal carbonyl?

    Solution

    By applying the EAN rule, the stability of metal carbonyl can be predicted. All the given metal carbonyls except Mn(CO)5 follow the EAN rule and thus, it exists as a dimer Mn2(CO)10.

     

  • Question 7
    1 / -0

    In the separation of Cu2+ and Cd2+ in the 2nd group of quantitative analysis of cations, tetraamine copper (II) sulphate and tetraamminecadmium (II) sulphate react with KCN to form the corresponding cyano complexes. Which one of the following pairs of complexes and their relative stability enables the separation of Cu2+ and Cd2+?

    Solution

    KCN first reduces CuSO4 and then precipitates it as copper (I) cyanide, Cu2(CN)2, which reacts with excess of KCN to form K3[Cu(CN)4]. On the other hand, cadmium forms K2[Cd(CN)4]. These complexes dissociate as:

    K3[Cu(CN)4] ⇌ 3K+ + [Cu(CN)4]3- ⇌ Cu+ + 4CN-
    K2[Cd(CN)4] ⇌ 2K+ + [Cd(CN)4]2- ⇌ Cd2+ + 4CN-

     

  • Question 8
    1 / -0

    Which of the following is not a double salt?

    Solution

    Potassium ferricyanide is a complex salt, not a double salt.

     

  • Question 9
    1 / -0

    Which one of the following coordination compounds is used to inhibit the growth of tumours?

    Solution

    Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are: cis–platin and related compounds.

     

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