Redox Reactions
Practice Test
1.
What is the equilibrium constant expression for the following reaction?
H
2
+ I
2
‹–› 2HI
SC.A.1.4.4
a.
K
eq
=
HI
2
/
H
2
I
2
b.
K
eq
=
HI
2
/
H
2
I
2
c.
K
eq
=
2HI
/ /
H
2
I
2
d.
K
eq
=
H
2
I
2
/
HI
2
2.
When the following equation is balanced what is the coefficient of Sn?
Sn +HNO
3
→SnO
2
+NO
2
+H
2
O
SC.B.1.4.2
a.
2
b.
3
c.
4
d.
1
3.
A 0.001
M
solution of HCl is ____________.
SC.A.1.4.4
a.
a weak acid solution
b.
a concentrated acid solution
c.
neutral
d.
a dilute acid solution
4.
The acid ionization constant,
K
a
, is __________ for __________ acids.
SC.A.2.4.1
a.
largest, weak
b.
smallest, weak
c.
largest, anhydride
d.
smallest, strong
5.
Balance the following equation. How many electrons must be transferred between the reducing agent and the oxidizing agent in this reaction?
H
2
S+HNO
3
→S+NO+H
2
0
SC.B.1.4.2
a.
6
b.
2
c.
3
d.
4
6.
If NaCl is added to a 0.010M solution of AgNO
3
in water at 25°C, what will be
Cl
-
when precipitation of AgCl begins? The Ksp for AgCl is 1.8 x 10
-10
.
SC.A.1.4.5
a.
1.0 x 10
-10
M
b.
1.8 x 10
-8
M
c.
1.8 x 10
-12
M
d.
1.3 x 10
-6
M
7.
What is the net ionic equation for the neutralization reaction between HF and KOH?
SC.B.1.4.2
a.
K
+
+ F
-
→ KF
b.
H
+
+ OH
-
→ H
2
O
c.
H
+
+ KOH → H
2
O + K
+
d.
HF + OH
-
→ H
2
O + F
-
8.
Which of the following compounds is not a salt?
SC.A.2.4.1
a.
FeCl
2
b.
K
2
SO
4
c.
Mg
OH
2
d.
BaCrO
4
9.
Balance the following equation with the smallest whole—number coefficients. How many moles of zinc will react with 6 moles of cobalt
III
chloride?
Zn
s
+CoCl
3
aq
→ZnCl
2
aq
+Co
s
SC.B.1.4.2
a.
6
b.
3
c.
2
d.
9
10.
What is the equilibrium constant expression for the following reaction?
PCl
5
‹–› PCl
3
+ Cl
2
SC.A.1.4.4
a.
K
eq
=
PCl
5
/
PCl
3
Cl
2
b.
K
eq
=
PCl
3
Cl
2
/
PCl
5
c.
K
eq
=
PCl
3
Cl
2
/
PCl
5
d.
K
eq
=
PCl
5
/
PCl
3
Cl
2
11.
What is the oxidation number of Group 17 nonmetals?
SC.A.2.4.5
a.
3
b.
-1
c.
0
d.
1
12.
Name the spectator ion in the following equation, including the correct coefficient:
Cu
s
+ 4HNO
3
aq
→ Cu
NO
3
2
aq
+ 2NO
2
+ 2H
2
O
l
a.
2NO
2
b.
3NO
3
c.
2NO
3
d.
3NO
2
13.
The most electronegative atom in a compound has a charge that is __________.
a.
neutral
b.
zero
c.
positive
d.
negative
14.
Under what condition is the OH
-
ion concentration in water expected to be zero?
SC.A.1.4.5
a.
in a solution of strong base
b.
in a solution of weak base
c.
never
d.
in a solution of strong acid
15.
At 298 K, pure water has a pH of __________.
SC.A.1.4.5
a.
-14
b.
14
c.
7
d.
0
16.
How many grams of MgF
2
will dissolve in 150 mL of 0.100
M
NaF solution? Ksp for MgF
2
is 6.4 x 10
-9
.
SC.A.1.4.4
a.
6.0 x 10
-6
g
b.
4.1 x 10
-6
g
c.
6.4 x 10
-7
g
d.
1.0 x 10
-5
g
17.
Calculate the H
+
ion and OH
-
ion concentrations in a 0.50
M
solution of HBr.
SC.A.1.4.4
a.
H
+
= 0.50
M
and
OH
-
= 2.0
M
b.
H
+
= 0.50
M
and
OH
-
= 0.50
M
c.
H
+
= 0.50
M
and
OH
-
= 2.0 ´ 10
-14
M
d.
H
+
= 1.0 ´ 10
-7
M
and
OH
-
= 1.0 ´ 10
-7
M
18.
A solution of pH = 2.1 would be described as __________.
SC.A.1.4.5
a.
slightly acidic
b.
slightly basic
c.
distinctly acidic
d.
distinctly basic
