Unit 7 Study Guide
1.
Consider the following reaction:
Ba(s) + F2(g)  BaF2
Which of the following statements is false?
A) The barium atom is gaining electrons;
therefore, it is oxidized.
B) The fluorine atom is gaining electrons;
therefore, it is oxidized.
C) The barium atom is losing electrons; therefore,
it is oxidized.
D) The fluorine atom is losing electrons;
therefore, it is reduced.
E) none of these
8.

The oxidation state of manganese in MnO 4 is
A)
B)
C)
D)
E)
2.
In the reaction 2Ca(s) + O2(g)  2CaO(s), calcium
is ______________.
A) reduced
B) electrolyzed
C) synthesized
D) oxidized
E) none of these
3.
In the reaction 2Cs(s) + Cl2(g)  2CsCl(s), the
chlorine is ______________.
A) reduced
B) oxidized
C) synthesized
D) electrolyzed
E) none of these
0
+3
+4
+7
+8
9.
The oxidation state of nitrogen in HNO3 is
A) +5
B) +4
C) +1
D) 0
E) -2
10.
The oxidation state of chlorine in ClO is
A) -2
B) -1
C) 0
D) +1
E) +2
11.
The oxidation state of Rb in any compound is
A) +2
B) +1
C) 0
D) -1
E) -2

4.
The oxidation state of carbon in K2CO3 is
A) -2
B) 0
C) +2
D) +4
E) +6
12.
The oxidation state of oxygen in O2 is
A) -2
B) -1
C) 0
D) -4
E) +4
5.
The oxidation state of chlorine in LiCl is
A) +1
B) 0
C) -1
D) -2
E) -3
13.
The oxidation state of titanium in TiO is
A) -2
B) -1
C) 0
D) +1
E) +2
6.
The oxidation state of nitrogen in NO2 is
A) -4
B) -2
C) 0
D) +2
E) +4
14.
The oxidation state of Ba in any compound is
A) 0
B) +1
C) +2
D) +3
E) +4
7.
The oxidation state of sulfur in SO 4 is
15.
The oxidation state of phosphorus in Mg3(PO4)2 is
A) 0
B) +2
C) +4
D) +5
E) +6
2
A)
B)
C)
D)
E)
+8
+6
+4
+2
0
Page 1
16.
What is the oxidation state of Cu in CuNO2?
A) -1
B) -2
C) 0
D) +1
E) +2
24.
The oxidation state of nitrogen in NH4Cl is
A) +1
B) +3
C) -3
D) -4
E) -2
17.
What is the oxidation state of Cr in Cr2 O 7 ?
2
25.
The oxidation state of chlorine in Cl2 is
A) 0
B) +1
C) -1
D) -2
E) none of these
26.
The oxidation state of carbon in CH4 is
A) +4
B) -4
C) +2
D) -2
E) none of these
27.
The oxidation state of carbon in CO2 is
A) +4
B) -4
C) +2
D) -2
E) none of these
28.
In reacting, metal atoms characteristically
A) become anions
B) lose electrons
C) decrease in oxidation state
D) form covalent bonds
A)
B)
C)
D)
E)
18.
+12
+6
+3
0
-2
What is the oxidation state of oxygen in Li2CO3?
A) -2
B) -1
C) 0
D) +1
E) +2
19.
Which of the following compounds contains
oxygen with an oxidation state of -2?
A) Na2CO3
B) TiO
C) KOH
D) Li3PO4
E) All of the compounds contain oxygen with an
oxidation state of -2.
20.
21.
22.
23.
What is the oxidation state of bromine in NH4Br?
A) -4
B) -2
C) -1
D) 0
E) +1
29.
Which statement is true of the following reaction?
2K + CuCl2  2KCl + Cu
A) Copper is reduced.
B) Chlorine is reduced.
C) Potassium is reduced.
D) Copper is oxidized.
E) Chlorine is oxidized.
What is the oxidation state of carbon in Fe2(CO3)3?
A) +4
B) +3
C) +2
D) 0
E) -2
30.
In which of the following does nitrogen have an
oxidation state of +4?
A) HNO3
B) NO2
C) N2O
D) NH4Cl
E) NaNO2
What is the oxidation state of iron in Fe2(CO3)3?
A) +4
B) +3
C) +2
D) 0
E) -2
31.
What is the oxidation state of oxygen in Fe2(CO3)3?
A) +4
B) +3
C) +2
D) 0
E) -2
Page 2
The oxidation state of chromium in K2CrO4 is
A) -1
B) +3
C) +7
D) +8
E) none of these
38.
In the reaction P4(s) + 10Cl2(g)  4PCl5(s),
phosphorus is ______________.
A) reduced
B) electrolyzed
C) synthesized
D) oxidized
E) none of these
32.
The following reaction occurs in aqueous acid
solution:
NO3- + I-  IO3- + NO2
The oxidation state of iodine in IO3- is
A) 0
B) +3
C) -3
D) +5
E) -5
39.
In the reaction P4(s) + 10Cl2(g)  4PCl5(s),
chlorine is ______________.
A) oxidized
B) reduced
C) synthesized
D) electrolyzed
E) none of these
Use the following to answer questions 33-34:
Answer the questions that refer to the following reaction:
TiCl4(l) + O2(g)  TiO2(s) + 2Cl2(g)
33.
34.
Which species is oxidized?
A) Ti
B) Cl
C) O
D) TiO2
E) O2
40.
In the reaction C(s) + O2(g)  CO2(g), carbon is
______________.
A) reduced
B) electrolyzed
C) synthesized
D) oxidized
E) none of these
Which species is the reducing agent?
A) Ti
B) Cl
C) O
D) TiCl4
E) O2
41.
Which of the following reactions does not involve
oxidation-reduction?
A) CH4 + 3O2  2H2O + CO4
B) Zn + 2HCl  ZnCl2 + H2
C) 2Na + 2H2O  2NaOH + H2
D) MnO2 + 4HCl  Cl2 + 2H2O + MnCl2
E) All are oxidation-reduction reactions.
Use the following to answer questions 35-36:
Answer the questions that refer to the following reaction:
SiO2(s) + 2C(s)  Si(s) + 2CO(g)
35.
Which species is reduced?
A) Si
B) C
C) O
D) CO
E) SiO2
36.
Which species is the oxidizing agent?
A) Si
B) C
C) O
D) SiO2
E) CO
42.
Which of the following are oxidation-reduction
reactions?
I. PCl3 + Cl2  PCl5
II. Cu + 2AgNO33  Cu(NO3)2 + 2Ag
III. CO2 + 2LiOH  Li2CO3 + H2O
IV. FeCl2 + 2NaOH  Fe(OH)2 + 2NaCl
A) III
B) IV
C) I and II
D) I, II, and III
E) I, II, III, and IV
43.
Which of the following statements is/are true?
Oxidation and reduction
A) cannot occur independently of each other
B) accompany all chemical changes
C) describe the loss and gain of electron(s),
respectively
D) result in a change in the oxidation states of the
species involved
E) a, c, and d are true.
37.
In the reaction N2(g) + 3H2(g)  2NH3(g), nitrogen
is ______________.
A) oxidized
B) reduced
C) synthesized
D) electrolyzed
E) none of these
Page 3
44.
In the reaction Zn + H2SO4  ZnSO4 + H2, which
element, if any, is oxidized?
A) zinc
B) hydrogen
C) sulfur
D) oxygen
E) None is oxidized.
50.
51.
Determine the coefficient for water in the balanced
equation for the reaction.
A) 1
B) 2
C) 3
D) 6
E) 7
45.
In the following reaction, which element is
oxidized?
8NaI + 5H2SO4  4I2 + H2S + 4Na2SO4 + 4H2O
A) sodium
B) iodine
C) sulfur
D) hydrogen
E) oxygen
52.
For the reaction of sodium bromide with chlorine
gas to form sodium chloride and bromine, the appropriation
half-reactions are (ox = oxidation and re = reduction)
A) ox: Cl2 + 2e-  2Clre: 2Br-  Br2 + 2e-
46.
Of the following four reactions, how many are
oxidation-reduction reactions?
NaOH + HCl  NaCl + H2O
Cu + 2AgNO3  2Ag + Cu(NO3)2
Mg(OH)2  MgO + H2O
N2 + 3H2  2NH3
A) 0
B) 1
C) 2
D) 3
E) 4
B) ox: 2Br-  Br2 + 2ere: Cl2 + 2e-  2Cl-
47.
In the reaction shown below, which species is
oxidized?
2NaI + Br2  2NaBr + I2
A) Na+
B) IC) Br2
D) BrE) I2
C) ox:
re:
Cl + + e-  ClBr  Br- + e-
D) ox:
re:
Br + 2e-  Br2Cl-  Cl2 + 2e-
E) ox: 2Na+ + 2e-  2Na
re: 2Cl-  Cl2 + 2e53.
In the balanced equation for the following redox
equation, what is the sum of the coefficients?
Fe3+ + I-  Fe2++ + I2
A) 4
B) 5
C) 6
D) 7
E) 8
48.
In the following reaction, which species is the
reducing agent?
3Cu + 6H+ + 2HNO3  3Cu2+ + 2NO + 4 H2O
A) H+
B) Cu
C) N in NO
D) Cu2+
E) N in HNO3
54.
The following reaction occurs in aqueous acid
solution:
NO3- + I-  IO3- + NO2
In the balanced equation, the coefficient of water is
A) 1
B) 2
C) 3
D) 4
E) 5
Use the following to answer questions 49-51:
Answer the following questions that refer to the unbalanced
reaction shown below as it occurs in acidic solution:
_______ Cr2O72- (aq) + _______ I-(aq)  _______ Cr3++(aq)
+ _______ I2(s)
49.
Determine the coefficient for the Cr3+ ions.
A) 1
B) 2
C) 3
D) 6
E) 7
Determine the coefficient for the iodide ions.
A) 1
B) 2
C) 3
D) 6
E) 7
Page 4
55.
For the redox reaction 2Fe2+ + Cl2  2Fe3+ + 6Cl-,
which of the following are the correct half-reactions?
I. Cl2 + 2e-  2ClII. Cl  Cl- + eIII. Cl2  2Cl- + 2eIV. Fe2+  Fe3+ + eV. Fe2+ + e-  Fe3+
A) I and IV
B) I and V
C) II and IV
D) II and V
E) III and IV
60.
In a car battery, which of the following is the
electrolyte?
A) Pb(s)
B) PbO2(s)
C) PbSO4(s)
D) H2SO4(aq)
E) none of these
61.
In a lead storage battery, PbO2 is found at the
______________.
A) cathode
B) anode
C) dry cell
D) galvanic cell
E) none of these
56.
When the following reaction is balanced in acidic
solution, what is the coefficient of water?
Zn(s) + NO3-(aq)  Zn2++(aq) + NH4+(aq)
A) 1
B) 2
C) 3
D) 4
E) none of these
62.
Most metals oxidize in air more slowly than
expected because
A) a thin layer of the metal oxide forms on the
metal surface, thus inhibiting corrosion
B) cathodic protection naturally occurs
C) corrosion occurs only under water
D) the concentration of oxygen in the atmosphere
is not high enough
E) none of these
57.
In the balanced equation for the following reaction
(in acidic solution)
ClO3- + Fe2+  Cl- + Fe3+
the coefficient of Fe2+ is
A) 1
B) 6
C) 2
D) 8
E) 3
63.
When a metal corrodes, what is happening
chemically?
A) The metal atoms lose electrons.
B) The metal atoms gain electrons.
C) Electrons are not involved.
D) The metal is combining with nitrogen gas.
E) none of these
58.
Which of the following is true for a galvanic cell
based on the following reaction?
Zn(s) + Cu2+(aq)  Zn2+(aq) + Cu(s)
A) The zinc is being reduced.
B) The zinc serves as the anode.
C) The Cu2+ ion is being reduced.
D) The Cu serves as the anode.
E) two of these
64.
Which of the following statements is not true of
electrolysis?
A) Electrolysis is a process where electrical
energy is used to produce a chemical change.
B) Electrolysis involves forcing a current through
a cell to produce a change that would otherwise not
occur.
C) The electrolysis of water produces hydrogen
gas and oxygen gas.
D) Electrolysis is used to recharge a lead storage
battery.
E) None of these; that is, all these statements are
true.
59.
Which of the following battery types is commonly
used in an automobile?
A) dry cell
B) alkaline dry cell
C) lead storage
D) mercury cell
E) nickel-cadmium
65.
Page 5
The Hall process for making aluminum involves
A) chemically reacting alumina with carbon
B) electrolysis of an aqueous solution of Al2O3
and Na3AlF6
C) electrolysis of a molten solution of Al2O3 and
Na3AlF6
D) none of the above
Answer Key
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2.
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5.
6.
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8.
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11.
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13.
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15.
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20.
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22.
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24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
C
D
A
D
C
E
B
D
A
D
B
C
E
C
D
D
B
A
E
C
A
B
E
C
A
B
A
B
A
B
E
D
B
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
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59.
60.
61.
62.
63.
64.
65.
Page 2
D
A
D
B
D
B
D
E
C
E
A
B
C
B
B
D
B
E
B
D
C
A
C
B
E
C
D
A
A
A
E
C