5. (a) (b) The complex ion NiC4² has two unpaired electrons, whereas Ni(CN)42 is diamagnetic. Propose structures for these two complex ions (square-planar or tetrahedral). Draw the crystal field diagrams of two complex ions.

Give the oxidation state of the metal species in the complex ion. [Fe(CN),(CO),P-

1) Is it possible to have isomers of the following coordination compounds? If this is the case, indicate the type of isomerism they present: [CoBrClI(OH2)] (tetrahedral) [Fe(CN)2(CH3NC)4]

Cobalt(III) has a coordination number of 6 in all its complexes. Is the carbonate ion a monodentate or bidentate ligand in the [Co(NH3)4(CO3)] + ion?

Sketch the following complexes. If more than one enantiomer exists, sketch just one.(a) mer-Cr(NH3)3(Cl)3 (b) cis-[Fe(H2O)4(CN)2]Cl (c) trans-[Ni(en)2Cl2] (d) fac-Co(NH3)3(CN)3

5. (a) (b) The complex ion NiC14² has two unpaired electrons, whereas Ni(CN)4² is diamagnetic. Propose structures for these two complex ions (square-planar or tetrahedral). Draw the crystal field diagrams of two complex ions.

You have a solution of the following ion: [Fe(H2O)6]3+ a) Is the ion more likely paramagnetic or diamagnetic? Please explain.  b) Predict how the crystal field splitting would change (increase or decrease) if all H2O ligands were replaced by NO2- in your solution.  c) What is the general color of your original solution and how would the color change in part “b”?

What is the charge on each of the following complex ions? hexaaquairon(II), [Fe(H2O)6]? tris(carbonato)ferrate(III), [Fe(CO3)3]? diaquatetrachlorovanadate(III), [V(H2O)2Cl4]? Express the charges numerically, in the order that the complexes are listed, separated by commas. For a nonzero charge, be sure to include the sign (e.g., +1,-2,+3).

Be sure to answer all parts. Complete the following statements for the complex ion [Co(en)2(H2O)CN]2+. (a) en is the abbreviation for     (b) The oxidation number of Co is     (c) The coordination number of Co is     (d)  is a bidentate ligand.     (en)    Co(en)2    CN    H2O

(a) Give the chemical name of Ir(CO)CI(PPh 3 ) 2 (either of the two isomers). (b) Sketch all isomers of the octahedral complex Cr(H2O), FBrCl (hint: there are five, and two of the five are enantiomers of each other).