Assignments:

1. Rank these coordinate complexes from highest to lowest Δ_o.
          Rh(CN)₆^3-, Rh(NH₃)₅³⁺, RhCl₆^3-

a)    Rh(CN)₆^3- > Rh(NH₃)₅³⁺ > RhCl₆^3-
b)    Rh(NH₃)₅³⁺ > RhCl₆^3- > Rh(CN)₆^3-
c)    RhCl₆^3- > Rh(CN)₆^3- > Rh(NH₃)₅³⁺
d)    Rh(CN)₆^3- > RhCl₆^3- > Rh(NH₃)₅³

2. The correct order of ligands in spectrochemical series is

a)    CN^- > OH^- > F^- > Cl^-
b)    OH^- > F^- > Cl^-> CN^-
c)    CN^- >  Cl^->  OH^-> F^-
d)    F^- > Cl^-> OH^-> CN^-

3. In octahedral complex ions, the t_2g orbitals are:

a) dxy, dx² - y²
b) dx² - y², dz²
c) dxy, dxz, dyz
d) dxz, dyz, dz²

4. CSFE for a high spin system is zero. Its electronic distribution is

a) t_2g⁴e_g⁰     b) t _2g⁶e_g³    c) t _2g⁴e_g²    d) t _2g³e_g²

5. The CN^- ion is a strong field ligand whereas Cl^- is usually a weak field ligand. Which of the following octahedral complexes has no unpaired electrons?

a) Ni(Cl)₆^4-
b) Fe(CN)₆^4-
c) FeF₆^4-
d) CuCl₆^4-

Answers:

1(a), 2(a), 3(c), 4(d), 5(b)