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Coordination Compounds Test - 2

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Coordination Compounds Test - 2
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  • Question 1
    4 / -1

     

    Only One Option Correct Type

    Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

    Q. 

    Primary and secondary valency of Pt in [Pt(en)2CI2] are

     

    Solution

     

     

    In [Pt(en)2CI2] the charge on the complex ion is +2 and coordination number is 6. Hence, the primary and secondary valency are +2 and 6 respectively.

     

     

  • Question 2
    4 / -1

     

    If zeise’s salt has the formula [Pt(C2H4)CI3]-. In this, platinum primary and secondary valency are

     

    Solution

     

     

    Let the oxidation state of pt be x.
    Oxidation state of cl is -1.
    So x + 0 – (1*3) must be equal to -1 since the charge of the whole compound is -1.
    x + 0 – (1*3) = -1
    x -3 = -1
    x = -1 + 3
    x = +2
    So the oxidation state of platinum is +2.
    Secondary is due to legend there are mono deadened legend 
    then 1×4= 4
     

     

     

  • Question 3
    4 / -1

     

    The two complexes PtCI4 . 2NH3 and PtCI4 . 2KCI do not give precipitate of AgCI when treate with AgNO3. The structures of these complexes are

     

    Solution

     

     

    Pt(NH3)2CI4] is neutral complex and no ions are formed in aqueous solution.

    K,(PtCl6] → 2K+ + [PtCI6]2-
    It does not have Cl- ion toffive precipitate of AgCI.

     

     

  • Question 4
    4 / -1

     

    A cobaltamine has the formula CoCI3 . xNH3. This when reacted with AgNO3 solution, one third of the chloride is precipitated. It can have the structure

     

    Solution

     

     

    Total chlorine molecules are 3 and one third means one chlorine molecule precipitates. So, one chlorine has to be outside the coordination sphere and that is in option C.

     

     

  • Question 5
    4 / -1

     

    Which is the incorrect ?

     

    Solution

     

     

    Mohr's salt is a doub le salt and it will give test for Fe2+ ion. It dissociates into simple substances or ions completely when dissolved in water.

     

     

  • Question 6
    4 / -1

     

    The spin only magnetic moment value (in Bohr magneton units) of Cr(CO)6 is

     

    Solution

     

     

    Cr(24) = [Ar]3d54s1
    Since (CO) is strong ligand, in Cr(CO)6 none of the electron is unpaired. Therefore ‘spin only’ magnetic moment is zero.

     

     

  • Question 7
    4 / -1

     

    The anion acetylacetonate (acac) forms chelate with Co3+, The ring of the chelate is

     

    Solution

     

     

    The acetylacetonate (acac) forms six membered ring as follows:

     

     

  • Question 8
    4 / -1

     

    Oxidation states of iron in the complexes [Fe(H2O)5NO]2+ and [Fe(CN)5NO]2- are

     

    Solution

     

     

    Correct Answer : a

    Explanation : NO in brown ring complex has +1 oxidation state.

    Let oxidation state of Fe be x.

    Since the overall charge on the coordination sphere, [Fe(H2O)5NO+]  is +2, the sum of oxidation states of all elements in it should be equal to +2.

    Therefore, x+1=+2

    or, x=+1 

    Hence, the oxidation state of iron in the brown ring complex is +1.

     

    [Fe(H2O)5NO+]2- iron is assigned an oxidation state of 2+. The iron center has a diamagnetic low-spin d6 electron configuration, although a paramagnetic long-lived metastable state has been observed by EPR spectroscopy. The chemical reactions of sodium nitroprusside are mainly associated with the NO ligand.

     

     

  • Question 9
    4 / -1

     

    Complexes in which the oxidation number of a metal is zero is/are

     

    Solution

     

     

    In [Ni(CO)4]
    Let the oxidation state of Ni is x.
    x + 4 x (0) = 0 (Carbonyl (CO) is a neutral ligand and have zero charge.)
    x = 0
    Hence, Ni have zero oxidation state.

     

     

  • Question 10
    4 / -1

     

    An example for bidentate and negatively charged ligand is

     

    Solution

     

     

    CH3COCH2COCH3

    It can ligate through two oxygen atoms.

     

     

  • Question 11
    4 / -1

     

    An example of double salt is/a

     

    Solution

     

     

    Common alum is K2SO4.AI2(SO4)3.24H2O and carnallite is KCl.MgCl2.6H2O.

     

     

  • Question 12
    4 / -1

     

    Type of bonding in K4 [Fe(CN)6] is/a

     

    Solution

     

     

    The complex K4[Fe(CN)6] whose formula can be written like that of double salt. Fe(CN)2 . 4KCN, dissociates to give K+ and [Fe(CN)6]4- ions in the aqueous solution.

     

     

  • Question 13
    4 / -1

     

    The effective atomic number of Fe in Fe(CO)5 is

     

    Solution

     

     

    The answer is 36 because in coordination compound we use EAN method due to which inert group atomic number or noble gas atomic number is more stable.

     

     

  • Question 14
    4 / -1

     

    Which of the following statements is/are correct?

     

    Solution

     

     

    [Co(en)3]CI3 produces 4 ions in solution as follows :
    [Co(en)3] CI3→ [Co(en)3]3+ + 3CI-

     

    1. is correct as charge on the complex ion will be +1

    2.  is incorrect as the complex will form 4 ions in solution

    3. is correct as there is no charge on the complex

    4. is also correct as cu+2 has blue color in solution

    Hence A correct.

     

     

  • Question 15
    4 / -1

     

    A freshly prepared aqueous solution of Pd(NH3)2CI2 does not conduct electricity, it suggests that

     

    Solution

     

     

    In the aqueous solution of Pd(NH3)2CI2, the atoms of chlorine I are in coordination sphere and the van't Hoff factor of the ] compound are unite.

     

     

  • Question 16
    4 / -1

     

    Comprehension Type

    Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    Complex compounds are addition compounds formed by the stoichiometric combination of two or more simple salts but do not decompose into constituent ions completely. The first such complex prepared by Tassaert is hexamine cobalt (III) chloride. Later many such compounds were prepared and their properties were studied. The chloramines complexes of cobalt (III) chromium (III) not only exhibit a spectrum of colours but also differ in the reactivity of their chlorides. Moreover, greater the number of ions produced by a complex in solution, greater is the electrical conductivity. This type of information was obtained for several series of complexes.

    Q. 

    Coordination number of Co in CoCl3 . 5H2O is six. The volume of 0.1 N AgNO3 needed to precipitate the chlorine in 200 mL of 0.01 M solution of complex is

     

    Solution

     

     

    Since, the oxidation number of Co is + 3 hence, the complex compound would be [CoCI . 5H2O]CI2.

    Hence, 1 mole of [CoCI . 5H2O]CI2 gives 2 moles of Cl- ion.
    Given, moles of [CoCI . 5H2O]CI2 = 200 mL x 0.01 M = 2 millimol
    2 millimol of [CoCI . 5H2O]CI2 will give 4 millimol of Cl-.

    Now, to neutralise 4 millimol of Cl-, 4 millimol of AgNO3 is required.
    Let the volume o! AgNO3 = VmL
    Millimoles of AgNO3 = 0.1 x V
    0.1 x V = 4 millimol

     

     

  • Question 17
    4 / -1

     

    Complex compounds are addition compounds formed by the stoichiometric combination of two or more simple salts but do not decompose into constituent ions completely. The first such complex prepared by Tassaert is hexamine cobalt (III) chloride. Later many such compounds were prepared and their properties were studied. The chloramines complexes of cobalt (III) chromium (III) not only exhibit a spectrum of colours but also differ in the reactivity of their chlorides. Moreover, greater the number of ions produced by a complex in solution, greater is the electrical conductivity. This type of information was obtained for several series of complexes.

    Q. 

    The number of ions per mole of the complex CoCI3 . 5NH3 in aqueous solution will be

     

    Solution

     

     

    [Co(NH3)5CI]CI2→[Co(NH3)5CI]2++ 2Cl- 
    Hence, 3 ions are present for one mole of the complex in the solution.

     

     

  • Question 18
    4 / -1

     

    Matching List Type

    Direction (Q. No. 18) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q. 

    'Match the Column I with Column II and mark the correct option from the codes given below.

     

    Solution

     

     

    (i) → (r), (ii) → (q), (iii) → (p), (iv) → (s)

     

     

  • Question 19
    4 / -1

     

    One Integer Value Correct Type

    Direction (Q. Nos. 19-23) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. 

    Formula of Mohr’s salt is FeSO4 . (NH4)2SO4 . xH2O. Here x value is

     

    Solution

     

     

    Formula of Mohr’s salt is FeSO4 . (NH4)2SO4 . 6H2O . Here, x is 6

     

     

  • Question 20
    4 / -1

     

    When AgNO3 solution is added in excess to 1 M solution of CoCI3 . xNH3, one mole of AgCI is formed. The value of x is

     

    Solution

     

     

    AgNO3 solution is added in excess of 1 M solution of CoCI3 . xNH3.
    CoCl3​.xNH3​+AgNO3​→AgCl (1mole)

    This precipitation of 1 mol of AgCl by this reaction shows that there is only one Cl outside the coordination sphere, which is not as a ligand ( as ligands are not ionisable).

    Hence, the compound must be as follows:(showing the coordination sphere) [Co(NH3​)4​Cl2​]Cl, as this is the octahedral complex, where it is clear that there are only 2 Cl as ligand and other ligands are NH3​. 

    So, 6−2 = 4 NH3​ ligands.

     

     

  • Question 21
    4 / -1

     

    The volume (in mL) of 0.1 M AgNO3 required for complex precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H2O)5Cl]Cl2, as silver chloride is close to

     

    Solution

     

     

    The correct answer is Option D
    Number of ionisable Cl− in [Cr(H2O)5Cl]Cl2 is 2.
    ∴ Millimoles of Cl− =30×0.01×2=0.6
    ∴ Millimoles of Ag+ required =0.6
    Now, 0.6/V(in ml)   = 0.1
    or, V=6 ml.

     

     

  • Question 22
    4 / -1

     

    Oxidation state of cobalt in Co(CO)6 is

     

    Solution

     

     

    ln Co(CO)6
    Let the oxidation state of Co is x.
    x + 6 x 0 = 0
    [Carbonyl (CO) is a neutral ligand hence, zero charg]
    x = 0
    Hence, Co has zero oxidation state.

     

     

  • Question 23
    4 / -1

     

    In the complex PtCl4 . 5NH3 if coordination number of platinum is 6, number of chloride ions precipitated by adding AgNO3 are

     

    Solution

     

     

    Coordination number of platinum is 6.
    ∴ Number of chloride ions precipitated by adding AgCI are 3.

     

     

  • Question 24
    4 / -1

     

    Statement Type

    Direction (Q. Nos. 24 and 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

    Q. 

    Statement I : Oxidation state of Fe in Fe(CO)5 is zero.
    Statement II : EAN of Fe in this complex is 36.

     

    Solution

     

     

    Statement I is true because CO is a neutral ligand, Statement II is true because
    EAN of Fe
    = Atomic number of Fe + Electrons gained by coordination
    = 26 + 2 x 5 = 36
    But Statement II is not the correct explanation. Correct explanation is that oxidation state of Fe in Fe(CO)5 is zero because CO is a neutral ligand.

     

     

  • Question 25
    4 / -1

     

    Statement I : The oxidation num ber of platinum in Zeise’s salt is +4.

    Statement II : Zeise’s salt is ionic complex.

     

    Solution

     

     

    Statement I The oxidation number of Pt in Zeis e’s salt is +2.
    Statement II Zeise’s salt is ionic complex with the formula K[PtCl3(C 2H4)].
    Hence, statement II is correct but statment I is incorrect.

     

     

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