Coordination Compounds Test - Answer Key

 

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  1. Give the number of geometric isomers for the square planar compound [MABCD] where M represents a metal and A, B, C, and D represent ligands.

      2.  

    • 1

      •  

    • 2

      •  

    • 3

      •  

    • 4

      •  

    • There are no geometric isomers

     

     

  2. The spectrochemical series is (going from weak to strong field):

     

    I - < Br - < Cl - < F - < OH - < H2O < NH3 < en < NO2 - < CN -

     

    Consider (1) [Co(I)6] 3-  and (2) [Co(CN)6] 3-

      3.  

    • (1) is paramagnetic, (2) is not.

      •  

    • (2) is paramagnetic, (1) is not.

      •  

    • Both are paramagnetic

      •  

    • None of them are paramagnetic

     

     

  3. Consider the complex ions Co(NH3)63+, Co(CN)63- and CoF63-. The reflected colors were violet, orange and green.  Match the complex ion to the color reflected.

    [Co(CN)6]3-                orange
    [CoF6]3-                      green
    [Co(NH3)6]3+             violet

    4.  

     

  4. Which of the following metal ions should be colorless?  Pick all that apply.

      5.  

    • Ti4+

      •  

    • Cu+

      •  

    • Cr3+

      •  

    • Sc2+

      •  

    • Zn2+

     

     

  5. What is the electron configuration for the transition metal ion in the compound:
    (NH4)2[Fe(H2O)2Cl4]

    Fe2+:   [Ar] 3d6

    6.  

     

  6. Name the following compounds:

      7.  

    • K2[Ag(H2O)3Br3]

      potassium triaquatribromoargentate(I)

      •  

    • [Mn(NH2CH2CH2NH2)3]SO4

      tris(ethylenediamine)manganese(II) sulfate

      •  

    • [Pt(NH3)4I2][PtI4]
      (hint: Pt is commonly found in the +2 or +4 oxidation state)

      tetraamminediiodoplatinum(IV) tetraiodoplatinate(II)

     

     

  7. Sodium nitroprusside, Na2[Fe(CN)5(NO)], is an octahedral complex given to heart transplant patients.  It contains the nitrosonium ligand, NO+, which is one of the few known cationic ligands.  Given this, determine the oxidation state of Fe in sodium nitroprusside.

      8.  

    • -1
    • 0
    • +1
    • +2
    • +3

     

     

  8. How many unpaired electrons are present in sodium nitroprusside?

      9.  

    • 0
    • 1
    • 2
    • 4
    • 5

     

     

  9. For the  reaction:

    [Fe (CN)5Br]3- + Br-    → [Fe(CN)4Br2]3- + CN-

    What would the predicted ratio of cis to trans isomer of the product?

    4:1

    10.  

     

  10. What is the name of the nonpolar complex ion, [Cr(H2O)4I2]+? Include cis/trans geometry.

    trans – tetraaquadiiodochromium (III) ion

    11.  

     

  11. What is the name of the polar complex ion, [CuCl2F2]2-?  Include cis/trans geometry.

    cis – dichlorodifluorocuprate (II) ion

    12.  

     

  12. Which of the following metal ions should exhibit the largest crystal field splitting?

      13.  

    • Fe3+
    • Ir3+
    • Mn3+
    • Co3+

     

     

  13. How many distinct geometric isomers are there in the figure below?


    Three

    14.  

     

  14. Is this compound capable of linkage isomerism?  If so, through which ligand.

      15.  

    • This is compound only exhibits stereoisomerism.

      •  

    • Yes, through the Br – ligand.

      •  

    • Yes, through the H2O ligand.

      •  

    • Yes, through the CN – ligand.

      •  

    • b-d are correct.

     

     

  15. The complex CrL62+, where L is a neutral ligand, appears yellow.  The number of unpaired d electrons in this complex ion is?

    2 unpaired e-

    16.  

     

  16. Give the number of geometric isomers for the octahedral compound [MA3B2C], where A, B and C represents ligands.

      17.  

    • 2
    • 3
    • 4
    • 5
    • 6

     

     

  17. Which metal has a d5 electron configuration?

      18.  

    • Pd2+
    • Ag+
    • Fe3+
    • Os2+
    • Co2+

     

     

  18. Excess Ag+ reacts with one mole of [COCl3(NH3)3].  How many moles of AgCl does this produce?

      19.  

    • 0
    • 1
    • 2
    • 3
    • 6

     

     

  19. Which of the following coordination compounds will form a precipitate when  treated with an aqueous solution of AgNO3?

      20.  

    • [Cr(NH3)3Cl3]

      •  

    • [Cr(NH3)6]Cl3

      •  

    • Na3[Cr(CN)6]

      •  

    • Na3[CrCl6]

      •  

    • all of these

     

     

  20. Calculate the total number of unpaired electrons in the following complex ions:

    Ni(H2O)62+, Fe(CN)42-, Co(NH3)62+.

    7 unpaired electrons

    21.  

     

  21. Give the number of geometric isomers for the octahedral compound [MAB4C], where A, B, and C represent ligands.

    Two

    22.  

     

  22. True or False

    The complex [HgI4] 2- ion could be expected to appear green because I- is a weak field ligand.

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