Chemistry: Molecular Nature of Matter and Change, 6th Edition (Silberberg)

Chapter 23: The Transition Elements and Their Coordination Compounds

Self-Assessment Quiz 2

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1
What is the electron configuration of a Cr atom?
A)[Ar]4s24d4
B)[Ar]4s23d4
C)[Ar]4s14d5
D)[Ar]4s23d5
E)none of the above
2
What is the electron configuration of a Ni2+ ion?
A)[Ar]4s23d8
B)[Ar]4s23d6
C)[Ar]3d8
D)[Ar]3d6
E)none of the above
3
Which, if any, of the following elements is not involved in human physiology as part of an enzyme or an enzymatic system?
A)manganese
B)iron
C)copper
D)zinc
E)They all form part of such systems.
4
The density of gold is 19.3 g/cm3 at 20°C, and its atomic mass is 197.0 How many atoms are in a cube of pure gold whose sides are 1.50 cm at 20°C?
A)1.99 ´ 1023
B)8.82 ´ 1022
C)6.14 ´ 1022
D)2.03 ´ 1024
E)1.16 ´ 1024
5
Xenon is element number 54, neodymium (Nd) is element number 60. Given that Nd has no 5d electrons, how many unpaired electrons are in the Nd atom?
A)0
B)1
C)2
D)3
E)4
6
Which of the following statements about lanthanides and actinides is incorrect?
A)The +3 oxidation state is the most common for both lanthanides and actinides.
B)All of the actinide elements are radioactive.
C)All of the lanthanide elements occur in nature.
D)All of the actinide elements are artificially made.
E)Due to similarities in their chemical properties, the actinide elements are not easily separated from each other.
7
Select the incorrect statement about the silver bromide photographic process for making a black-and-white negative. If there are no incorrect statements, select statement E.
A)Hydroquinone is oxidized in the development stage.
B)Unreacted Ag+ is removed by complexation with thiosulfate ion.
C)The latent image is invisible.
D)The black regions contain very small particles of elemental silver.
E)All of the above statements are correct.
8
What are the coordination number (C.N.) and oxidation number (O.N.) of chromium in the complex ion [Cr(NH3)2(NO2)4]-?
A)C.N. = 6; O.N. = +4
B)C.N. = 6; O.N. = +3
C)C.N. = 5; O.N. = +2
D)C.N. = 4; O.N. = +3
E)C.N. = 4; O.N. = +4
9
Consider the tetrahedral geometry of the complex ion [MnCl4]2-. Which of the following statements about this ion is correct?
A)Any plane that contains two chlorine nuclei divides the ion into two mirror-image halves.
B)Manganese is in the +6 oxidation state.
C)There is a plane, that contains the manganese nucleus, that divides the ion into two mirror-image halves.
D)Manganese has a coordination number of 6.
E)There is an axis that passes through a chlorine nucleus, around which a 180° rotation produces a structure identical to the structure before rotation.
10
Consider the hexaamminechromium(III) ion. Which of the following statements about the ion is incorrect?
A)Each NH3 ligand donates an electron pair to a Lewis acid to form the ion.
B)Each nitrogen in the ion has an unshared lone pair of electrons.
C)Each Cr-N bond is a coordinate covalent bond.
D)There are unpaired electrons present in this ion.
E)Each ligand is a Lewis base.
11
What is the correct formula for diamminedichloroethylenediaminecobalt(III) bromide?
A)[CoCl2(en)(NH3)2]Br2
B)[CoCl2(en)2(NH3)2]Br
C)[CoCl(en)(NH3)2]Br
D)[CoCl2(en)(NH3)2]Br
E)[CoCl2(en)2(NH3)2]Br2
12
How many isomers are possible for the complex ion [Cr(NH3)(OH)2Cl3]2-?
A)5
B)4
C)3
D)2
E)1
13
Which of the following ions is least likely to form colored compounds?
A)Mn2+
B)Fe3+
C)Sc3+
D)Cr3+
E)Cu2+
14
Which of the following octahedral complexes should have the largest crystal field splitting energy, D?
A)[Cr(NH3)]3+
B)[Cr(SCN)6]3-
C)[Cr(H2O)]3+
D)[Cr(CN)6]3-
E)[CrCl6]3-
15
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)NiCl64-
B)Fe(CN)64-
C)FeF64-
D)CuCl64-
E)Fe(CN)63-
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