Download Ch 22 Practice worksheet

Practice Problems;
1. What are the oxidation numbers of the central metal atom in the following coordination
compounds? K3[Fe(CN)6], [Cr(NH3)4Br2]Br, [Ni(H2O)6]Cl2, Na2[TaF7] are
[A] 3, 3, 3, 5 [B] -3, 1, 2, 5 [C] 3, 3, 2, 7 [D] -3, 3, 2, 5 [E] 3, 3, 2, 5
2. Which of the following is a d7 ion?
[A] Cu(II)
[B] Co(II) [C] Mn(II)[D] Mn(IV)[E] At least two of these (a-d) are d7 ions.
3. True or false: Transition metals show great similarities both within a given period and within
a given vertical group.
4. What is the sum of the geometric and optical isomers that the complex ion Co(en)2Cl2+
exhibits?
[A] 0 [B] 1 [C] 3 [D] 2 [E] 4
5. The ____ isomer of the complex Ni(en)2Cl2 exhibits optical isomers, but the _____ isomer
does not.
[A] trans, cis [B] cis, trans [C] Both isomers exhibit optical isomers.
[D] Neither isomers exhibit optical isomers.
6. Which of the transition metals is the best conductor of heat and electric current?
[A] titanium [B] silver [C] tungsten [D] gold [E] copper
7. A complex ion is a charged species consisting of a metal ion surrounded by
[A] hydrogen ions. [B] ligands. [C] ligands and counter ions.
[D] other transition metals. [E] none of these
8. What is the electron configuration of the Mn(II) ion?
[A] [Ar] 4s23d3 [B] [Ar] 3d5 [C] [Ar] 4s23d5 [D] [Ar] 4s13d5 [E] none of these
9. The complex ions of Zn2+ are all colorless. The most likely explanation for this is:
[A] Zn2+ is paramagnetic.
[B] Zn2+ is not a transition metal ion.
[C] Zn2+ exhibits –d orbital” splittings in its complexes such that they absorb all wavelengths in
the visible region.
[D] Since Zn2+ is a d10 ion, it does not absorb visible light even though the –d orbital” splittings
are correct for absorbing visible wavelengths.
[E] None of these are correct.
10. The expected electron configuration of Cu+ is [Ar]3s13d9. (T/F)
11. Because they have the same atoms, bonds, and formulas, geometric isomers have the same
color.
12. Calculate the total number of unpaired electrons in the following complex ions: Zn(OH2)62+,
Ni(CN)42- (square planar), Co(NH3)63+ (strong field).
[A] 3 [B] 4 [C] 2 [D] 1 [E] 0
13. Specify the number of unpaired electrons.
a) 0 b) 1 c) 2 d) 4 e) 5
NiCl42- (tetrahedral)
14. The complex FeL62+, where L is a neutral ligand, is known to be diamagnetic. The number
of d electrons in this complex ion is:
[A] 8 [B] 4 [C] 7 [D] 6 [E] 5
15. Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in
complex ions. Based on this information, predict the number of unpaired electrons in CoF63-.
[A] 1 [B] 2 [C] 3 [D ] 0[E] 4
16. The complex ion Co(NH3)62+ (three unpaired electrons) is classified as:
[A] strong field [B] no way to tell [C] weak field
17. Which of the following statements is true about the octahedral complexes of Ni2+?
[A] Both strong- and weak-field complexes are paramagnetic.
[B] Both strong- and weak-field complexes are diamagnetic.
[C] The strong-field complex is diamagnetic and the weak-field complex is paramagnetic.
[D] The strong-field complex is paramagnetic and the weak-field complex is diamagnetic.
18. How many unpaired electrons are there in Ir(Br)64-? (Br- is a weak-field ligand.)
[A] 3 [B] 4 [C] 0 [D] 1 [E] 2
19. A metal ion in a high-spin octahedral complex has two more unpaired electrons than the same
ion does in a low-spin octahedral complex. The metal ion could be:
[A] V2+ [B] Cr3+ [C] Cu2+ [D] Co2+ [E] Mn2+
20. Which of the following is true in describing the crystal field model?
[A] The ligands are treated as negative point charges.
[B] The electrons are assumed to be localized.
[C] The metal ion and ligand interaction is treated as a Lewis acid–base interaction.
[D] The metal ion–ligand bonds are considered to be completely ionic.
[E] None of these are true.
21. Which of the following are structural isomers?
I. coordination isomers
II. linkage isomers
III. geometric isomers
IV. optical isomers
[A] I, II [ B] II, IV [C] I, III, IV [D] II, III [E] I, III
22. Which complex ion shape is not capable of showing cis–trans isomerism?
[A] tetrahedral [B] octahedral [C] square planar [D] none of these
23. Define stereoisomerism.
24. The color of a transition metal complex results from:
[A] bending vibrations. [B] transition of an electron between an s and a p orbital.
[C] transition of an electron between d orbitals. [D] nuclear magnetic resonance.
[E] stretching vibrations.
25. How many unpaired electrons are found in each of the following complex ions?
[Co(NH3)4]2+
26. All tetrahedral complex ions are high spin.(T/F)
27. How many unpaired electrons are found in each of the following complex ions?
[Cr(CN)4]228. Copper(I) complexes would be expected to be colorless.(T/F)
29. Transition metals display great similarities
[A] within a given period. [B] within a given vertical group. [C] with the semimetals.
[D] all of these [E] a and b only
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