Question

In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has five d electrons and L is a strong field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons?
A. 0
B. 1
C. 2
D. 3
E. 5

Which one of these complex ions would absorb light with the shortest wavelength?
A. [Co(H₂O)₆]²⁺
B. [Co(NH₃)₆]²⁺
C. [CoF₆]^4–
D. [Co(CN)₆]^4–
E. [Co(en)₆]²⁺

The ion [Co(NH₃)₆]²⁺ is octahedral and high spin. This complex is (4pts) SHOW WORK
A. paramagnetic, with 1 unpaired electron.
B. paramagnetic, with 3 unpaired electrons.
C. paramagnetic, with 4 unpaired electrons.
D. paramagnetic, with 5 unpaired electrons.
E. diamagnetic.

Ethylenediaminetetraacetic acid (EDTA) is
A. not useful as a chelating agent.
B. an effective antidote for heavy metal poisoning (e.g., Pb²⁺ and Hg²⁺).
C. a monodentate ligand.
D. known to form unstable complex ions with Fe³⁺, Hg²⁺, and Zn²⁺.
E. known to form complexes with platinum that inhibit the growth of cancerous cells.

What is the oxidation number of Co in the complex Na[Co(H₂O)₂Cl₄]?
A. +1
B. +2
C. +3
D. +4
E. None of the above

What is the coordination number of chromium in Cr(en)₂Cl₂?
A. 2
B. 4
C. 6
D. 8
E. None of the above

Select True or False: A molecule or ion that provides an electron pair for coordinate covalent bond formation is called a Lewis acid.
A. True

B. False