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Coordination Compounds Test - 3

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Coordination Compounds Test - 3
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following statements is not correct?

    Solution

    The complexes [NiCI4]2- and [Ni(CN)4)2- have the same primary valency.

     

  • Question 2
    1 / -0

    According to the postulates of Werner's theory, for coordination compounds,

    Solution

    This option is correct because as per Werner's theory of coordination compounds, only primary valency is ionisable.

     

  • Question 3
    1 / -0

    The coordination number of Co in the complex compound [Co(NH3)6]CI3 is

    Solution

    The total number of coordination bonds formed between the central metal and the ligands is termed as the coordination number.
    This refers to the secondary valency of the central metal atom.

    [Co(NH3)6]CI3 has 6 monodentate NH3 ligands bonded to the central metal. So, the coordination number of Co in the given complex is 6.

     

  • Question 4
    1 / -0

    An example of a complex compound with a central atom having a coordination number 4 is:

    Solution

    The total number of coordinate bonds by which the ligands are bonded to the central metal is the coordination number or the secondary valency of the metal.

    [Cu(NH3)4]Cl2 has 4 monodentate NH3 ligands bonded to the central metal, so it is an example of a complex compound having coordination number 4.

     

  • Question 5
    1 / -0

    An example of chelating ligands is

    Solution

    Chelating ligands are those polydentate ligands which can form a ring around the metal atom. The complex formed is known as a chelate complex. Ethylenediamine (en) is a well-known chelating ligand for coordination compounds.

     

  • Question 6
    1 / -0

    In the complex K4[Fe(CN)6], the effective atomic number (in amu) is

    Solution

    Effective atomic number of K4[Fe(CN)6] = 26 - 2 + 12 = 36

     

  • Question 7
    1 / -0

    The oxidation state of Cr in K[Cr(NH3)3Cl3] is

    Solution

    For [Cr(NH3)3Cl3], the oxidation state of of Cr is x (say).
    x - 3 = 0
    x = + 3

     

  • Question 8
    1 / -0

    Which of the following statements is incorrect for [Fe(H2O)5NO]2+?

    Solution

    The brown ring test is performed by adding iron(II) sulphate to a solution of a nitrate, then slowly adding concentrated sulphuric acid, such that the acid forms a layer below the aqueous solution.

    2HNO3 + 3H2SO4 + 6FeSO4 → 3Fe2(SO4)3 + 2NO + 4H2O
    [Fe(H2O)6]SO4 + NO = [Fe(H2O)5(NO)]SO4 + H2O
    Charge on Fe ⇒ x - 1 = +2
    x = 3

    The nitrosonium complex is formed by transfer of an electron from Fe+2 to NO.
    Ferrous ion is oxidised to ferric and nitric oxide is reduced to nitric oxide anion.

     

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