Name: 
 

Chemistry 3202 Unit 4 Practice Quiz


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Which atom in the reaction below has a decrease of 3 in oxidation number?
mc001-1.jpg
a.
Cr
b.
K
c.
O
d.
S
 

 2. 
If the half reaction below is balanced in acidic solution, how many moles of hydrogen
ions are required to balance the overall equation?
mc002-1.jpg
a.
1
b.
2
c.
3
d.
4
 

 3. 
What is the oxidation number of carbon in CO32-?
a.
-4
b.
-2
c.
+2
d.
+4
 

 4. 
Which is reduced in the reaction below?
mc004-1.jpg
a.
O2(g)
b.
O2-(aq)
c.
Sn(s)
d.
Sn2+(aq)
 

 5. 
Which half reaction is balanced for both atoms and charge?
mc005-1.jpg
a.
A
b.
B
c.
C
d.
D
 

 6. 
What is the Eo value for the reduction of Y3+(aq) in the reaction below?
mc006-1.jpg
a.
-2.37
b.
-1.66
c.
+1.66
d.
+2.37
 

 7. 
Which is the cathode in the diagram below?
mc007-1.jpg
a.
Cu(s)
b.
Cu2+(aq)
c.
Pb(s)
d.
Pb2+(aq)
 

 8. 
What is the oxidation number of O in O2(g)?
a.
-2
b.
0
c.
+1
d.
+2
 

 9. 
Which species is reduced in the reaction below?
mc009-1.jpg
a.
Zn(s)
b.
Zn2+(aq)
c.
Cu(s)
d.
Cu2+(aq)
 

 10. 
How are pyrometallurgy and hydrometallurgy similar?
a.
They are primary treatments that involve extracting metals.
b.
They are primary treatments that involve refining metals.
c.
They are secondary treatments that involve extracting metals.
d.
They are secondary treatments that involve refining metals.
 



 
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