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Coordination Compounds Test - 21

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Coordination Compounds Test - 21
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  • Question 1
    1 / -0

    The correct IUPAC name of [Fe(C5H5)2] is

    Solution

    The correct answer is option B.

    The I.U.P.A.C. name for Fe(C5H5)2 is bis(η5 -cyclopentadienyl) iron(II) 
    The oxidation state of iron is +2 and is written in parenthesis in roman numerals. Two cyclopentadienyl ligands are coordinated to Fe. The prefix bis indicates 2. η5 indicates that the cyclopentadienyl ligands are penta coordinates.

  • Question 2
    1 / -0

    Type of isomerism exhibited by [Cr(NCS)(NH3)5] [ZnCl4] :

    Solution


    Since both cation & anion constitute coordination sphere so it exhibit coordination isomerism and contains ambident ligand so, it shows linkage isomerism

  • Question 3
    1 / -0

    A complex compound in which the oxidation number of a metal is zero is

    Solution

    A complex compound in which the oxidation number of metal is zero is [Ni(CO)4​]. In this complex, the oxidation number of both metal and ligand is zero.

    The oxidation number of metal in the complexes K4​[Fe(CN)6​], K3​[Fe(CN)6​] and [Pt(NH3)4]Cl2 are +2, +3 and +2 respectively.

  • Question 4
    1 / -0

    Trioxalato aluminate (III) and tetrafluorido-borate (III) ions are respectively :

    Solution

    O. N. of Al = +3
    O. N. of B = + 3
    [BF4]-
    [Al(C2O3)3]3-

  • Question 5
    1 / -0

    Which of the ligand can show linkage isomerism and acts as flexidentate ligand:

    Solution

  • Question 6
    1 / -0

    Consider the following statements, "According the Werner's theory. :

    (1) Ligands are connected to the metal ions by covalent bonds.

    (2) Secondary valencies have directional properties.

    (3) Secondary valencies are non-ionisable.

    (4) Secondary valencies are satisfied by either neutral or negative legands.

    Of these statements.

    Solution

    Consider werner’s theroy

  • Question 7
    1 / -0

    From the stability constant (hypothetical values), given below, predict which is the strongest ligand:

    Solution

    Higher the value of K higher will be strength of ligand & more will be thermodynamic stability of complex produced.

  • Question 8
    1 / -0

    The complexes given below show:

    and

    Solution


  • Question 9
    1 / -0

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

    Solution

    [Ni0(CO)4]
    [Cr3+(NH3)2][Ni4+F6]3
    [Ni2+(NH3)2][B+3F4]2
    K4[Ni+2(CN)6]

  • Question 10
    1 / -0

    An ion M2+, forms the complexes [M(H2O)6]2+, [M(en)3]2+ and [MBr6]4-, match the complex with the appropriate colour.

    Solution

    Δo value is directly proportional to energy and inversely related to the wavelength. Also, more the ligand is a strong field ligand More will be the value of Δo and lower will be its wavelength. Among the given complexes the strength of ligands are Br− < H2O < en.

    Since the emitted colours are red, green, blue the absorbed colours must be green,red,orange. Hence the  compound [M(H2O)6]2+, [M(en)3]2+, [M(Br)6]4− are blue red and green respectively. Hence option B is correct.

  • Question 11
    1 / -0

    For the complex ion dichlorido bis (ethylene diamine) cobalt (III), select the correct statement.

    Solution

  • Question 12
    1 / -0

    Co(CO)4 follows EAN rule by :

    Solution

    [Co(CO)4]
    EAN = 27 –(0)+ 4 × 2 = 35
    2[Co(CO)4] → Co2(CO)8

    EAN = 27 + 1 + 4 ×2 = 36

  • Question 13
    1 / -0

    Type of isomerism exhibited by [Ir(OCN)2(H2O)3]

    Solution

    –OCN is ambident ligand & it shows linkage isomerism.

  • Question 14
    1 / -0

    Which of the following complex exhibits geometrical isomerism:

    Solution

    [PtBrCl NH3 Py] Pt2+ is dsp2 hybridised & hence geometry is square planner & sq. planner complex with four different ligands shows geometrical isomerism.

  • Question 15
    1 / -0

    A complex of platinum, ammonia and chloride produces four ions per molecule in the solution. The structure consistent with the observation is :

    Solution


    [Pt(NH3)4]Cl4 → 5 ions
    [Pt(NH3)2Cl4] → 0 ions
    [Pt(NH3)4Cl2]Cl2 → 3 ions

  • Question 16
    1 / -0

    The total number of possible isomers of the compound [Cu||(NH3)4] [Pt||Cl4] are :

    Solution

  • Question 17
    1 / -0

    In the complex Fe(CO)x, the value of x is :

    Solution

    [Fe(CO)x]0
    EAN = 26 + 2x = 36
    x = 5

  • Question 18
    1 / -0

    The complex which exhibits cis-trans isomerism as well as can be resolved into d and ℓ forms:

    Solution


  • Question 19
    1 / -0

    The oxidation state of Mo in its oxo-complex species [Mo2O4(C2H4 )2(H2O)2]2- is :

    Solution

    Let the O. N. of Mo in the complex is x
     2x + (–2) × 2 + 0 × 2 + 0 × 2  = – 2

  • Question 20
    1 / -0

    The hybridisation and unpaired electrons in [Fe(H2O)6]2+ ion are :

    Solution

    H2O is weak field ligand

  • Question 21
    1 / -0

    In which complex is the transition metal in zero oxidation state:

    Solution

    K4[Ni(CN)4] Let O.S of Ni = x
    4 + x – 4 = 0
    x = 0
    (A) Co3+  (B)  Fe2+  (C) Co–1

  • Question 22
    1 / -0

    Formula of ferrocene is :

    Solution

  • Question 23
    1 / -0

    The hybrisation of Co in [Co(H2O)6]3+ is :

    Solution

    In this complex compound the total charge is +3 as H2O is a neutral compound so the oxidation state of cobalt is +3 and the electronic configuration of Co is 3d7 4s2. So, Co(+3)=4d6 and H2O is a weak ligand so there is no pairing of electron. So,4s 4p3 and 4d2 orbital make hybrid orbital to have a hybridization of sp3d2.

  • Question 24
    1 / -0

    Which of the following is π complex :

    Solution

    Al(C2H5)3 σ - complex
    Fe(C5H5)2 π - complex
    Zn(C2H5)2 σ - complex
    [Ni(CO)4] σ - complex

  • Question 25
    1 / -0

    Which complex is likely to show optical activity

    Solution

    Cis [Co(NH3)2(en)2]3+

    No POS optically active rest compound has POS.

  • Question 26
    1 / -0

    Which one is the most likely structure of CrCl3·6H2O if 1/3 of total chlorine of the compound is precipitated by adding AgNO3 to its aqueous solution :

    Solution

    Coordination no. of Cr = 6
    1/3 × 3 = 1 Chloride ion is outside the coordination sphere.

  • Question 27
    1 / -0

    The two compounds [Co(SO4)(NH3)5]Br and [Co(SO4)(NH3)5]Cl represent :

    Solution

    Different molecular mass, so no isomerism

  • Question 28
    1 / -0

    The structure of iron pentacarbonyl is :

    Solution

    [Fe(CO)5] TBP
    CO is strong field ligand
    Fe - 3d64s2

  • Question 29
    1 / -0

    The EAN of platinum in potassium hexachloroplatinate (IV) is :

    Solution

    K2+4[PtCl6]
    At No. Pt = 78
    EAN = 78 – 4 + 6 × 2 = 86

  • Question 30
    1 / -0

    Diethylene triamine is :

    Solution

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