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Coordination Compounds Test - 4

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Coordination Compounds Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    In which of the following compounds the oxidation state of the nickel atom is 0?

    Solution

    CO is neutral ligand and the overall charge on the complex is 0 so Ni has 0 oxidation state.

  • Question 2
    1 / -0

    What is the coordination number of chromium in [Cr(NH​​​​​3)2(H2O​​​​2)2]Cl​​​​​3?

    Solution

    Coordination number of the central metal atom/ion in a complex is the number of ligand donor atoms directly bonded to it. There are 4 ligands attached to Cr so its coordination number= 4.

  • Question 3
    1 / -0

    Which of the following is non – ionizable?

    Solution

    In [Co(NH3)3Cl3], there is no ion present outside the coordination sphere so it is non-ionizable. All the negative ions/neutral molecules inside the coordination sphere satisfy the secondary valence and are non-ionisable.

  • Question 4
    1 / -0

    Which of the following pair contains a complex salt and double salt respectively?

    Solution

    [Cu(NH3)4]SO4 this is a complex salt because it contains a coordination entity (central metal ion Cu2+ with 4 ligand molecules of NH3 in coordination sphere) while K2SO4.Al2(SO4)3.24H2O is double salt as it can dissociate completely into simple ions when it is dissolved in water.

  • Question 5
    1 / -0

    In which of the following compounds, the cemtcen metal atom/ion is in the lowest oxidation state?

    Solution

    CO is a neutral ligand. The overall charge on the given complex is 0. So, Mn has zero oxidation state.

  • Question 6
    1 / -0

    The theory which uses the concept of hybridised orbitals to explain the nature of bonding in coordintion compounds is:

    Solution

    According to Valence Bond Theory, the metal atom or ion under the influence of ligands can use its (n-1)d, ns, np or ns, np, nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral, square planar and so on. These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding. So Valence bond theory uses the concept of hybridised orbitals to explain the bonding in complexes.

  • Question 7
    1 / -0

    The type of hybridisation possible with a coordination number of 6 can be

    Solution

    sp3d2 hybridisation means there are 6 orbitals involved in hybridisation (1 ns, 3 np and 2 nd) and 6 hybrid orbitals are formed. So with a coordination number 6, this hybridisation is possible.

  • Question 8
    1 / -0

    The oxidation state of Ag in tollen’s reagent is

    Solution

    Tollen's reagent contains diamminesilver(I) complex. So oxidation state of Ag in tollen’s reagent is +1.

  • Question 9
    1 / -0

    Which is not true about a ligand?

    Solution

    A polydentate ligand has more than one donor atoms which can bind to the central metal atom/ion. So it can act as a chelate ligand.

  • Question 10
    1 / -0

    In which of the following complexes, the nickel metal is in the highest oxidation state?

    Solution

    The given complex can be written as K2[NiF6]. Let oxidation state of Ni be x. Potassium ion K+ carries a +1 charge. So two K+ means a total of +2 charge which implies an overall charge of -2 on the complex anion. Each F​​​​​​- carries -1 charge. So,
    x + 6(-1) = -2
    x - 6 = -2
    x = -2 + 6 = +4
    So, the oxidation state of Ni is +4 and is the highest among the given complexes.

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