Question

1. In [Cu(NH₃)₄]CO₃, how many 3d electrons does copper have?
A. 6
B. 7
C. 8
D. 9
E. 10

2. In the complex ion [Fe(CN)₆]^4–, the oxidation number of Fe is
A. +1.
B. +2.
C. +3.
D. –4.
E. +6.

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3. Which of the following choices can function as a monodentate ligand only?
A. H₂NCH₂CH₂NH₂
B. ^–O₂CCO₂^–
C. H₂O
D. ^–OCH₂CH₂CH₂O^–
E. H₂PCH₂CH₂PH₂

4. In the complex ion [Co(en)₂Br₂]⁺, the oxidation number of Co is
A. +1.
B. +2.
C. +3.
D. –2.
E. –1.

5. Give the coordination number (C.N.) and oxidation number (O.N.) of the metal atom in the coordination compound [Cr(NH₃)₂(en)Cl₂].
A. C.N. = 4; O.N. = +2.
B. C.N. = 5; O.N. = +3.
C. C.N. = 5; O.N. = +2.
D. C.N. = 6; O.N. = +3.
E. C.N. = 6; O.N. = +2.

6. In the coordination compound K₂[Co(en)Cl₄], the coordination number (C.N.) and oxidation number (O.N.) of cobalt are
A. C.N. = 6; O.N. = +2.
B. C.N. = 6; O.N. = +3.
C. C.N. = 5; O.N. = +2.
D. C.N. = 5; O.N. = +4.
E. C.N. = 4; O.N. = +3.

7. In the coordination compound [Pt(NH₃)₂Cl₂], the coordination number and oxidation number of the central atom are, respectively,
A. 2, 0.
B. 4, 4.
C. 5, 0.
D. 4, 2.
E. 6, 2.