Download practice test 4 CHM 112

practice test 4 CHM 112
Student: ___________________________________________________________________________
1. In Al2Cl6, the geometry of the molecule at each aluminum atom is
A. trigonal planar.
B. tetrahedral.
C. trigonal pyramidal.
D. square planar.
E. octahedral.
2. Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called
A. steel.
B. cast iron.
C. coke.
D. pig iron.
E. hematite.
3. Which of these reactions represents the removal of silica from iron ore in a blast furnace?
A. SiO2(s)  SiO2(g)
B. SiO2(s) + CaO(s)  CaSiO3(l)
C. SiO2(s) + 4HF(g)  SiF4(g) + 2H2O(g)
D. SiO2(s) + C(s)  Si(l) + CO2(g)
E. SiO2(s) + CO(g)  SiCO3(l)
4. The mineral cryolite, Na3AlF6, is used in the Hall process for aluminum production as
A. the source of aluminum (the ore).
B. a chemical reducing agent.
C. a material that forms a slag and thus removes impurities.
D. a solvent for alumina, Al2O3 .
5. Which one of these elements would give a p-type semiconductor when added to a silicon crystal?
A. C
B. P
C. As
D. Ga
E. Sb
6. The equilibrium 3Fe(s) + C(s)
Fe3C(s) is established in a solid solution. For such a solution, one can
write an equilibrium constant in the usual way except that here one has concentrations that refer to solids in the
solid solution. Determine the equilibrium constant for the formation of cementite from iron and carbon at
680C.
[Given: for this reaction at 25C, H = 21 kJ/mol and S = 20.4 J/mol·K]
A. 0.75
B. 0.33
C. 3.1
D. 0.82
E. 1.2
7. Which one of these normally would not be obtained by chemical reduction?
A. Fe
B. Ti
C. Zn
D. Mg
E. Ag
8. Calcium metal is produced by electrolysis of
A. CaSO4.
B. CaF2.
C. CaCO3.
D. Ca(OH)2.
E. CaCl2.
9. Which one of these species is an example of a basic oxide?
A. SO3(g)
B. BaO(s)
C. Al2O3(s)
D. Fe2O3(s)
E. SiO2(s)
10. The term catenation describes the
A. tendency of carbon atoms to form cations in the presence of alkali metals.
B. process of creating synthetic gas from coal.
C. extraction of precious metals with sodium or potassium cyanide.
D. ability of carbon atoms to form long chains and rings.
E. interaction of Group 4A elements with Group 8A elements at high pressures and temperatures to form
coordination compounds.
11. What element is the most abundant by mass in Earth's crust?
A. Fe
B. H
C. K
D. P
E. O
12. Which of these industrial chemicals is produced in the greatest amount annually?
A. HNO3
B. H3PO4
C. H2
D. H2SO4
E. HClO3
13. When in the liquid state, which one of these substances resembles water, insofar as it is a solvent for many
electrolytes and even undergoes autoionization as water does?
A. N2
B. Cl2
C. NH3
D. N2O
E. Xe
14. Which of these substances is the active ingredient in ordinary household bleach?
A. HCl
B. Cl2
C. NaCl
D. NaClO
E. NaClO4
15. The presence of ozone in the upper atmosphere is important because
A. O3 absorbs outgoing radiation from the earth's surface, thus helping to keep the earth warm.
B. O3 absorbs harmful solar radiation.
C. O3 dissolves in water droplets and is very reactive.
D. O3 is a major reactant in photosynthesis.
16. When phosphate rock, Ca3(PO4)2(s), is converted to phosphorus,
A. one of the products of the reaction is water.
B. sulfuric acid is added to generate insoluble calcium sulfate.
C. hydrogen is used to reduce the phosphate to phosphorus.
D. silica is added to form a calcium silicate slag.
E. oxygen must be added to prevent reaction of P4.
17. Ozone (O3) and oxygen gas (O2) are examples of
A. isotopes.
B. allotropes.
C. polymorphs.
D. alloys.
E. amphoterism.
18. In the complex ion [Cr(C2O4)2(H2O)2]-, the oxidation number of Cr is
A. +1.
B. +2.
C. +3.
D. -2.
E. -1.
19. In the complex ion [Co(en)2Br2]+, the oxidation number of Co is
A. +1.
B. +2.
C. +3.
D. -2.
E. -1.
20. In the coordination compound [Cr(NH3)2(en)Cl2]Br2, the coordination number (C.N.) and oxidation number
(O.N.) of the metal atom, respectively are
A. C.N. = 6; O.N. = +4.
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.
21. How many 3d electrons does a Mn2+ ion have?
A. 1
B. 2
C. 3
D. 4
E. 5
22. The best name for K4[FeCl2(CN)4] is
A. tetrapotassium dichlorodicyanoiron(II).
B. potassium dichlorodicyanoiron(II).
C. potassium dichlorodicyanoferrate(III).
D. tetrapotassium dichlorobis(cyano)iron(III).
E. potassium dichlorotetracyanoferrate(II).
23. How many unpaired electrons are there in the complex ion [Mn(CN)6]3- ?
A. 0
B. 1
C. 2
D. 3
E. 4
24. Which of these electron energy level patterns would absorb light with the shortest wavelength?
A. A
B. B
C. C
D. D
25. The electron configuration of a chromium atom is
A. [Ar]4s24d3.
B. [Ar]4s24p4.
C. [Ar]4s23d3.
D. [Ar]4s23d4.
E. [Ar]4s13d5.
26. Cis-trans isomerism is exhibited by which one of these ions?
A. [Pd(NH3)3Cl]+
B. [Co(NH3)5Cl]2+
C. [Fe(CN)6]3D. all of these
E. none of these
practice test 4 CHM 112 Key
1. In Al2Cl6, the geometry of the molecule at each aluminum atom is
a. trigonal planar.
B. tetrahedral.
c. trigonal pyramidal.
d. square planar.
e. octahedral.
Chang - 020 Metallurgy... #34
Difficulty: Medium
2. Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called
A. steel.
b. cast iron.
c. coke.
d. pig iron.
e. hematite.
Chang - 020 Metallurgy... #4
Difficulty: Medium
3. Which of these reactions represents the removal of silica from iron ore in a blast furnace?
a. SiO2(s)  SiO2(g)
B. SiO2(s) + CaO(s)  CaSiO3(l)
c. SiO2(s) + 4HF(g)  SiF4(g) + 2H2O(g)
d. SiO2(s) + C(s)  Si(l) + CO2(g)
e. SiO2(s) + CO(g)  SiCO3(l)
Chang - 020 Metallurgy... #5
Difficulty: Medium
4. The mineral cryolite, Na3AlF6, is used in the Hall process for aluminum production as
a. the source of aluminum (the ore).
b. a chemical reducing agent.
c. a material that forms a slag and thus removes impurities.
D. a solvent for alumina, Al2O3 .
Chang - 020 Metallurgy... #29
Difficulty: Medium
5. Which one of these elements would give a p-type semiconductor when added to a silicon crystal?
a. C
b. P
c. As
D. Ga
e. Sb
Chang - 020 Metallurgy... #14
Difficulty: Medium
6. The equilibrium 3Fe(s) + C(s)
Fe3C(s) is established in a solid solution. For such a solution, one can
write an equilibrium constant in the usual way except that here one has concentrations that refer to solids in the
solid solution. Determine the equilibrium constant for the formation of cementite from iron and carbon at
680C.
[Given: for this reaction at 25C, H = 21 kJ/mol and S = 20.4 J/mol·K]
a. 0.75
b. 0.33
c. 3.1
D. 0.82
e. 1.2
Chang - 020 Metallurgy... #36
Difficulty: Difficult
7. Which one of these normally would not be obtained by chemical reduction?
a. Fe
b. Ti
c. Zn
D. Mg
e. Ag
Chang - 020 Metallurgy... #7
Difficulty: Medium
8. Calcium metal is produced by electrolysis of
a. CaSO4.
b. CaF2.
c. CaCO3.
d. Ca(OH)2.
E. CaCl2.
Chang - 020 Metallurgy... #27
Difficulty: Medium
9. Which one of these species is an example of a basic oxide?
a. SO3(g)
B. BaO(s)
c. Al2O3(s)
d. Fe2O3(s)
e. SiO2(s)
Chang - 020 Metallurgy... #24
Difficulty: Medium
10. The term catenation describes the
a. tendency of carbon atoms to form cations in the presence of alkali metals.
b. process of creating synthetic gas from coal.
c. extraction of precious metals with sodium or potassium cyanide.
D. ability of carbon atoms to form long chains and rings.
e. interaction of Group 4A elements with Group 8A elements at high pressures and temperatures to form
coordination compounds.
Chang - 021 Nonmetallic... #6
Difficulty: Medium
11. What element is the most abundant by mass in Earth's crust?
a. Fe
b. H
c. K
d. P
E. O
Chang - 021 Nonmetallic... #19
Difficulty: Easy
12. Which of these industrial chemicals is produced in the greatest amount annually?
a. HNO3
b. H3PO4
c. H2
D. H2SO4
e. HClO3
Chang - 021 Nonmetallic... #15
Difficulty: Medium
13. When in the liquid state, which one of these substances resembles water, insofar as it is a solvent for many
electrolytes and even undergoes autoionization as water does?
a. N2
b. Cl2
C. NH3
d. N2O
e. Xe
Chang - 021 Nonmetallic... #9
Difficulty: Medium
14. Which of these substances is the active ingredient in ordinary household bleach?
a. HCl
b. Cl2
c. NaCl
D. NaClO
e. NaClO4
Chang - 021 Nonmetallic... #16
Difficulty: Medium
15. The presence of ozone in the upper atmosphere is important because
a. O3 absorbs outgoing radiation from the earth's surface, thus helping to keep the earth warm.
B. O3 absorbs harmful solar radiation.
c. O3 dissolves in water droplets and is very reactive.
d. O3 is a major reactant in photosynthesis.
Chang - 021 Nonmetallic... #14
Difficulty: Medium
16. When phosphate rock, Ca3(PO4)2(s), is converted to phosphorus,
a. one of the products of the reaction is water.
b. sulfuric acid is added to generate insoluble calcium sulfate.
c. hydrogen is used to reduce the phosphate to phosphorus.
D. silica is added to form a calcium silicate slag.
e. oxygen must be added to prevent reaction of P4.
Chang - 021 Nonmetallic... #11
Difficulty: Medium
17. Ozone (O3) and oxygen gas (O2) are examples of
a. isotopes.
B. allotropes.
c. polymorphs.
d. alloys.
e. amphoterism.
Chang - 021 Nonmetallic... #13
Difficulty: Easy
18. In the complex ion [Cr(C2O4)2(H2O)2]-, the oxidation number of Cr is
a. +1.
b. +2.
C. +3.
d. -2.
e. -1.
Chang - 022 Transition... #14
Difficulty: Difficult
19. In the complex ion [Co(en)2Br2]+, the oxidation number of Co is
a. +1.
b. +2.
C. +3.
d. -2.
e. -1.
Chang - 022 Transition... #13
Difficulty: Difficult
20. In the coordination compound [Cr(NH3)2(en)Cl2]Br2, the coordination number (C.N.) and oxidation number
(O.N.) of the metal atom, respectively are
A. C.N. = 6; O.N. = +4.
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.
Chang - 022 Transition... #16
Difficulty: Difficult
21. How many 3d electrons does a Mn2+ ion have?
a. 1
b. 2
c. 3
d. 4
E. 5
Chang - 022 Transition... #6
Difficulty: Medium
22. The best name for K4[FeCl2(CN)4] is
a. tetrapotassium dichlorodicyanoiron(II).
b. potassium dichlorodicyanoiron(II).
c. potassium dichlorodicyanoferrate(III).
d. tetrapotassium dichlorobis(cyano)iron(III).
E. potassium dichlorotetracyanoferrate(II).
Chang - 022 Transition... #28
Difficulty: Medium
23. How many unpaired electrons are there in the complex ion [Mn(CN)6]3- ?
a. 0
b. 1
C. 2
d. 3
e. 4
Chang - 022 Transition... #45
Difficulty: Medium
24. Which of these electron energy level patterns would absorb light with the shortest wavelength?
a. A
b. B
c. C
D. D
Chang - 022 Transition... #41
Difficulty: Medium
25. The electron configuration of a chromium atom is
a. [Ar]4s24d3.
b. [Ar]4s24p4.
c. [Ar]4s23d3.
d. [Ar]4s23d4.
E. [Ar]4s13d5.
Chang - 022 Transition... #2
Difficulty: Easy
26. Cis-trans isomerism is exhibited by which one of these ions?
a. [Pd(NH3)3Cl]+
b. [Co(NH3)5Cl]2+
c. [Fe(CN)6]3d. all of these
E. none of these
Chang - 022 Transition... #31
Difficulty: Medium
Category
# of Questions
Chang - 020 Metallurgy...
9
Chang - 021 Nonmetallic...
8
Chang - 022 Transition...
9
Difficulty: Difficult
4
Difficulty: Easy
3
Difficulty: Medium
19