Section 20.1
Oxidation and Reduction
Practice Test
1.
What is the oxidation number of Group 17 nonmetals?
a.
-1
b.
0
c.
1
d.
3
Hint
2.
Which of the following describes oxidation?
a.
gain of electrons
b.
gain of positive charge
c.
loss of electrons
d.
loss of positive charge
Hint
3.
When is the oxidation number of oxygen not -2?
a.
in water
b.
in oxyacids
c.
in peroxide
d.
in sulfuric acid
Hint
4.
When an atom undergoes oxidation, the ___________ changes.
a.
mass
b.
identity
c.
isotope
d.
charge
Hint
5.
Oxidation is __________.
a.
the loss of electrons and an increase in charge
b.
the loss of electrons and a decrease in charge
c.
the gain of electrons and an increase in charge
d.
the gain of electrons and a decrease in charge
Hint
6.
What is the oxidation number of N in KNO
3
?
a.
6
b.
5
c.
3
d.
-3
Hint
7.
What is the oxidation number of O in Na
2
SO
4
?
a.
6
b.
1
c.
+2
d.
-2
Hint
8.
The highest possible oxidation number for carbon is ________.
a.
+8
b.
6
c.
4
d.
2
Hint
9.
Select the compound in which chlorine has the highest possible oxidation number.
a.
HCl
b.
HClO
c.
HClO
3
d.
HClO
4
Hint
10.
Which of the following reactions is a redox reaction?
a.
H
+
(aq) + OH
-
(aq) → H
2
O(l)
b.
2KBr(aq) + Pb(NO
3
)
2
(aq) → 2KNO
3
(aq) + PbBr
2
(s)
c.
CaBr
2
(aq) + H
2
SO
4
(aq) → CaSO
4
(s) + 2HBr(aq)
d.
2Al(s) + 3H
2
SO
4
(aq) → Al
2
(SO
4
)
3
(aq) + 3H
2
(g)
Hint
11.
In the following reaction, which chemical species is the oxidizing agent?
5H
2
O
2
+ 2MnO
4
-
+ 6H
+
→ 2Mn
2+
+ 8H
2
O + 5O
2
a.
H
2
O
2
b.
MnO
4
-
c.
H
+
d.
Mn
2+
Hint
12.
In a redox reaction, the number of electrons lost by the reducing agent ____________.
a.
equals the number of protons in the reducing agent
b.
equals the number of protons in the oxidizing agent
c.
equals the number of electrons lost by the oxidizing agent
d.
equals the number of electrons gained by the oxidizing agent
Hint
13.
The most electronegative atom in a compound has a charge that is __________.
a.
positive
b.
negative
c.
neutral
d.
zero
Hint
14.
Which of the following types of reactions do not usually involve redox?
a.
synthesis
b.
decomposition
c.
single-replacement
d.
double-replacement
Hint
15.
What element is oxidized in the following reaction?
3Cu + 8HNO
3
→ Cu(NO
3
)
2
+ 2NO + 4H
2
O
a.
Cu
b.
H
c.
N
d.
O
Hint
16.
Predict the products of the following single—replacement reaction.
Fe(s) + CuSO
4
(aq) → ?
a.
CuS(s) + Fe
2
SO
4
(aq)
b.
Fe(s) + Cu(s) + SO
4
(aq)
c.
Cu(s) + FeSO
4
(aq)
d.
FeCuSO
4
Hint
17.
Group 1A metal ions have an oxidation number of _______.
a.
1
b.
2
c.
3
d.
-1
Hint
18.
What is the oxidizing agent in the following reaction?
6KOH(aq) + 3Cl
2
(g) → KClO
3
(aq) + 5KCl(aq) + 3H
2
O(l)
a.
KOH
b.
Cl
2
c.
KClO
3
d.
KCl
Hint
