Download Chem 2 Chapter 22 worksheet key ( Scroll down to

Chem 2
Ch # 21 worksheet.
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
[C] -3, 1, 2, 5
B] 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)
C] Co(II)
[B] 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.
Consider the pseudo-octahedral complex of Cr3+ shown, where A and B represent Lewis bases and
where A produces a stronger crystal field than B. Draw an appropriate crystal field diagram for this
complex (include the electrons).
26. How many unpaired electrons are found in each of the following complex ions?
[Co(NH3)4]2+
27. All tetrahedral complex ions are high spin.(T/F)
28. How many unpaired electrons are found in each of the following complex ions?
[Cr(CN)4]229. Copper(I) complexes would be expected to be colorless.(T/F)
30. 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
Reference: 21.1,3
[1] [E]
Reference: 21.1
[2] [C]
Reference: 21.1
[3] [A]
Reference: 21.4
[4] [C]
Reference: 21.4
[5] [B]
Reference: 21.1
[6] [B]
Reference: 21.1
[7] [B]
Reference: 21.1
[8] [B]
Reference: 21.6
[9] [D]
Reference: 21.1
[10] [B]
Reference: 21.4
[11] [B]
Reference: 21.6
[12] [E]
Reference: 21.6
[13] c) 2
Reference: 21.6
[14] [D]
Reference: 21.6
[15] [E]
Reference: 21.6
[16] [C]
Reference: 21.6
[17] [A]
Reference: 21.6
[18] [A]
Reference: 21.6
[19] [D]
Reference: 21.6
[20] [A]
Reference: 21.4
[21] [A]
Reference: 21.4
[22] [A]
Reference: 21.4
[23] See Sec. 21.4 of Zumdahl, Chemistry.
Reference: 21.6
[24] [C]
Reference: 21.6
[25]
Reference: 21.6
[26] 3
Reference: 21.6
[27] [A]
Reference: 21.6
[28] 4
Reference: 21.6
[29] [A]
Reference: 21.1
[30] [E]