Chapter-9 Coordination Compounds

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  • Chapter-9 Coordination Compounds Assignments 1

    Why are different colours observed in octahedral and tetrahedral complexes
    for the same metal and same ligands?

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  • Chapter-9 Coordination Compounds Assignments 2

    What is the relationship between observed colour of the complex and the
    wavelength of light absorbed by the complex?

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  • Chapter-9 Coordination Compounds Assignments 3

    Match the coordination compounds given in Column I with the central metal
    atoms given in Column II and assign the correct code :
    Column I (Coordination Compound)                                 Column II (Central metal atom)
    A. Chlorophyll                                                            1. rhodium
    B. Blood pigment                                                        2. cobalt
    C. Wilkinson catalyst                                                   3. calcium
    D. Vitamin B12                                                          4. iron
                                                                                 5. magnesium

    Code :
    (i) A (5) B (4) C (1) D (2)
    (ii) A (3) B (4) C (5) D (1)
    (iii) A (4) B (3) C (2) D (1)
    (iv) A (3) B (4) C (1) D (2)

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  • Chapter-9 Coordination Compounds Assignments 4

    Name the type of isomerism when ambidentate ligands are attached to central

    metal ion. Give two examples of ambidentate ligands.

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  • Chapter-9 Coordination Compounds Assignments 5

    Why do compounds having similar geometry have different magnetic moment?

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  • Chapter-9 Coordination Compounds Assignments 6

    Why are low spin tetrahedral complexes not formed?

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  • Chapter-9 Coordination Compounds Assignments 7

    On the basis of crystal field theory explain why Co(III) forms paramagnetic
    octahedral complex with weak field ligands whereas it forms diamagnetic
    octahedral complex with strong field ligands.

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  • Chapter-9 Coordination Compounds Assignments 8

    Magnetic moment of [MnCl4]2– is 5.92 BM. Explain giving reason.

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  • Chapter-9 Coordination Compounds Assignments 9

    A coordination compound CrCl3⋅4H2O precipitates silver chloride when treated
    with silver nitrate. The molar conductance of its solution corresponds to a
    total of two ions. Write structural formula of the compound and name it.

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  • Chapter-9 Coordination Compounds Assignments 10

    What are ambidentate ligands? Give two examples for each.

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  • Chapter-9 Coordination Compounds Assignments 11

    Using IUPAC norms write the formula for the following: Tetrahydroxozincate(II) 

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  • Chapter-9 Coordination Compounds Assignments 12

    Using IUPAC norms write the formula for the following: Hexaamminecobalt(III)

    sulphate

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  • Chapter-9 Coordination Compounds Assignments 13

    Using IUPAC norms write the formula for the following: Pentaamminenitrito-O- cobalt(III)

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  • Chapter-9 Coordination Compounds Assignments 14

    Using IUPAC norms write the systematic name of the following: [Co(NH3)6]Cl3

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  • Chapter-9 Coordination Compounds Assignments 15

    Using IUPAC norms write the systematic name of the following: [Pt(NH3)2Cl(NH2CH3)]Cl

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  • Chapter-9 Coordination Compounds Assignments 16

    Using IUPAC norms write the systematic name of the following: [Co(en)3]3+

     

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  • Chapter-9 Coordination Compounds Assignments 17

    Draw the structures of optical isomers of:  c[Cr(C2O4)3]3–

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  • Chapter-9 Coordination Compounds Assignments 18

    What is meant by the chelate effect? Give an example.

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  • Chapter-9 Coordination Compounds Assignments 19

     What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

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  • Chapter-9 Coordination Compounds Assignments 20

    A solution of [Ni(H2O)6]2+  is green but a solution of [Ni(CN)4]2−  is colourless. Explain. 

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  • Chapter-9 Coordination Compounds Assignments 21

    Write all the geometrical isomers of [Pt(NH3)(Br)(Cl)(py)] and how many of these will exhibit optical isomers?

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  • Chapter-9 Coordination Compounds Assignments 22

    What is meant by stability of a coordination compound in solution? State the factors which govern stability of complexes.

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  • Chapter-9 Coordination Compounds Assignments 23

    Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration and coordination number. Also give stereochemistry and magnetic moment of the complex:

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  • Chapter-9 Coordination Compounds Assignments 24

    Amongst the following, the most stable complex is

    (i) [Fe(H2O)6]3+

    (ii) [Fe(NH3)6]3+

    (iii) [Fe(C2O4)3]3-

    (iv) [FeCl6]3-

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  • Chapter-9 Coordination Compounds Assignments 25

    The oxidation number of cobalt in K[Co(CO)4] is

    (i) +1

    (ii) +3

    (iii) -1

    (iv) -3

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  • Chapter-9 Coordination Compounds Assignments 26

    Amongst the following ions which one has the highest magnetic moment value?

    (i) [Cr(H2O)6]3+

    (ii) [Fe(H2O)6]2+

    (iii) [Zn(H2O)6]2+

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  • Chapter-9 Coordination Compounds Assignments 27

    How many ions are produced from the complex Co(NH3)6Cl2 in solution?

    (i) 6

    (ii) 4

    (iii) 3

    (iv) 2

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  • Chapter-9 Coordination Compounds Assignments 28

    Discuss briefly giving an example in each case the role of coordination compounds in:

    (i) biological system

    (ii) medicinal chemistry

    (iii) analytical chemistry

    (iv) extraction/metallurgy of metals

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  • Chapter-9 Coordination Compounds Assignments 29

    What is meant by the chelate effect? Give an example.

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  • Chapter-9 Coordination Compounds Assignments 30

    What is meant by stability of a coordination compound in solution? State the factors which govern stability of complexes.

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  • Chapter-9 Coordination Compounds Assignments 31

    Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration and coordination number. Also give stereochemistry and magnetic moment of the complex:

    (i) K[Cr(H2O)2(C2O4)2].3H2O

    (ii) [Co(NH3)5Cl]Cl2

    (iii) CrCl3(py)3

    (iv) Cs[FeCl4]

    (v) K4[Mn(CN)6]

     

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  • Chapter-9 Coordination Compounds Assignments 32

    Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complexes:

    (i) K3[Co(C2O4)3]

    (ii) cis-[Cr(en)2Cl2]Cl

    (iii) (NH4)2[CoF4]

    (iv) [Mn(H2O)6]SO4

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  • Chapter-9 Coordination Compounds Assignments 33

    Discuss the nature of bonding in metal carbonyls.

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  • Chapter-9 Coordination Compounds Assignments 34

    Fe(CN)6]4- and [Fe(H2O)6]2+ are of different colours in dilute solutions. Why?

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  • Chapter-9 Coordination Compounds Assignments 35

    A solution of [Ni(H2O)6]2+ is green but a solution of [Ni(CN)4]2- is colourless. Explain.

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  • Chapter-9 Coordination Compounds Assignments 36

    [Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2- is diamagnetic. Explain why?

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  • Chapter-9 Coordination Compounds Assignments 37

    What is crystal field splitting energy? How does the magnitude of Δo decide the actual configuration of d-orbitals in a coordination entity?

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  • Chapter-9 Coordination Compounds Assignments 38

    What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

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  • Chapter-9 Coordination Compounds Assignments 39

    Draw figure to show the splitting of d orbitals in an octahedral crystal field.

     

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  • Chapter-9 Coordination Compounds Assignments 40

    Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory:

    (i) [Fe(CN)6]4-

    (ii) [FeF6]3-

    (iii) [Co(C2O4)3]3-

    (iv) [CoF6]3-

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  • Chapter-9 Coordination Compounds Assignments 41

    What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?

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  • Chapter-9 Coordination Compounds Assignments 42

    Aqueous copper sulphate solution (blue in colour) gives:

    (i) a green precipitate with aqueous potassium fluoride, and

    (ii) a bright green solution with aqueous potassium chloride

    Explain these experimental results.

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  • Chapter-9 Coordination Compounds Assignments 43

    Write all the geometrical isomers of [Pt(NH3)(Br)(Cl)(py)] and how many of these will exhibit optical isomers?

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  • Chapter-9 Coordination Compounds Assignments 44

    Draw all the isomers (geometrical and optical) of:

    (i) [CoCl2(en)2]+

    (ii) [Co(NH3)Cl(en)2]2+

    (iii) [Co(NH3)2Cl2(en)]+

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  • Chapter-9 Coordination Compounds Assignments 45

    Draw the structures of optical isomers of:

    (i) [Cr(C2O4)3]3-

    (ii) [PtCl2(en)2]2+

    (iii) [Cr(NH3)2Cl2(en)]+

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  • Chapter-9 Coordination Compounds Assignments 46

    How many geometrical isomers are possible in the following coordination entities?

    (i) [Cr(C2O4)3]3- (ii) [Co(NH3)3Cl3]

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  • Chapter-9 Coordination Compounds Assignments 47

    List various types of isomerism possible for coordination compounds, giving an example of each.

     

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  • Chapter-9 Coordination Compounds Assignments 48

    Using IUPAC norms write the systematic names of the following:

    (i) [Co(NH3)6]Cl3

    (ii) [Pt(NH3)2Cl(NH2CH3)]Cl

    (iii) [Ti(H2O)6]3+

    (iv) [Co(NH3)4Cl(NO2)]Cl

    (v) [Mn(H2O)6]2+

    (vi) [NiCl4]2-

    (vii) [Ni(NH3)6]Cl2

    (viii) [Co(en)3]3+

    (ix) [Ni(CO)4]

     

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  • Chapter-9 Coordination Compounds Assignments 49

    Using IUPAC norms write the formulas for the following:

    (i) Tetrahydroxozincate(II)

    (ii) Potassium tetrachloridopalladate(II)

    (iii) Diamminedichloridoplatinum(II)

    (iv) Potassium tetracyanonickelate(II)

    (v) Pentaamminenitrito-O-cobalt(III)

    (vi) Hexaamminecobalt(III) sulphate

    (vii) Potassium tri(oxalato)chromate(III)

    (viii) Hexaammineplatinum(IV)

    (ix) Tetrabromidocuprate(II)

    (x) Pentaamminenitrito-N-cobalt(III)

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  • Chapter-9 Coordination Compounds Assignments 50

    Specify the oxidation numbers of the metals in the following coordination entities:

    (i) [Co(H2O)(CN)(en)2]2+

    (ii) [CoBr2(en)2]+

    (iii) [PtCl4]2-

    (iv) K3[Fe(CN)6]

    (v) [Cr(NH3)3Cl3]

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  • Chapter-9 Coordination Compounds Assignments 51

    What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.

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  • Chapter-9 Coordination Compounds Assignments 52

    Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.

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  • Chapter-9 Coordination Compounds Assignments 53

    FeSO4 solution mixed with (NH4)2SO4 solution in 1:1 molar ratio gives the test of Fe2+ ion but CuSO4solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of Cu2+ ion. Explain why?

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  • Chapter-9 Coordination Compounds Assignments 54

    Explain the bonding in coordination compounds in terms of Werner's postulates.

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  • Chapter-9 Coordination Compounds Assignments 55

    Calculate the overall complex dissociation equilibrium constant for the Cu(NH3)42+ ion, given that β4 for this complex is 2.1 x 1013.

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  • Chapter-9 Coordination Compounds Assignments 56

    The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

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  • Chapter-9 Coordination Compounds Assignments 57

    Predict the number of unpaired electrons in the square planar [Pt(CN)4]2- ion.

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  • Chapter-9 Coordination Compounds Assignments 58

    Explain [Co(NH3)6]3+ is an inner orbital complex whereas [Ni(NH3)6]2+ is an outer orbital complex.

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  • Chapter-9 Coordination Compounds Assignments 59

    [Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic. Explain.

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  • Chapter-9 Coordination Compounds Assignments 60

    [NiCl4]2- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why?

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  • Chapter-9 Coordination Compounds Assignments 61

    Explain on the basis of valence bond theory that [Ni(CN)4]2- ion with square

    planar structure is diamagnetic and the [NiCl4]2- ion with tetrahedral geometry is paramagnetic.

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  • Chapter-9 Coordination Compounds Assignments 62

    Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionization isomers.

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  • Chapter-9 Coordination Compounds Assignments 63

    Indicate the types of isomerism exhibited by the following complexes and

    draw the structures for these isomers:

    1.  i.            K[Cr(H2O)2(C2O4)2
    2. ii.            [Co(en)3]Cl3
    3. iii.            [Co(NH3)5(NO2)](NO3)2
    4. iv.            [Pt(NH3)(H2O)Cl2]

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  • Chapter-9 Coordination Compounds Assignments 64

    Write the IUPAC names of the following coordination compounds:

    (i) [Co(NH3)6]Cl3

    (ii) [Co(NH3)5Cl]Cl2

    (iii) K3[Fe(CN)6]

    (iv) K3[Fe(C2O4)3]

    (v) K2[PdCl4]

    (vi) [Pt(NH3)2Cl(NH2CH3)]Cl

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  • Chapter-9 Coordination Compounds Assignments 65

    Write the formulas for the following coordination compounds:

    (i) Tetraamminediaquacobalt(III) chloride

    (ii) Potassium tetracyanonickelate(II)

    (iii) Tris(ethane-1,2-diamine) chromium(III) chloride

    (iv) Amminebromidochloridonitrito-N-platinate(II)

    (v) Dichloridobis(ethane-1,2-diamine)platinum(IV) nitrate

    (vi) Iron(III) hexacyanoferrate(II)

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