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Unit 11: Redox
Test Description: Redox review
Instructions: Answer all questions to get your test result.
1) Write the oxidation state for each of the elements in cryolite, Na3AlF6:
A
+1, +3, -6
B
+1, +3, -1
C
+1, -3, -1
D
+3, +3, -6
2) In an electrolytic cell, oxidation takes place at the:
A
anode, which is negative
B
cathode, which is positive
C
anode, which is positive
D
anode, which is negative
3) In the reaction: 2H2(g) + O2(g) --> 2H2O(g), the oxidizing agent is
A
O2-
B
H2
C
H-
D
O2
4) Which statement best describes the reaction represented by the equation:2NaCl + 2H2O + electricity --> Cl2 + H2 + 2NaOH
A
The reaction occurs in a voltaic cell and releases energy.
B
The reaction occurs in an electrolytic cell and absorbs energy.
C
The reaction occurs in a voltaic cell and absorbs energy.
D
The reaction occurs in an electrolytic cell and releases energy.
5) What is the oxidation number of iodine in NaIO3?
A
+1
B
+6
C
+3
D
+5
6) Which species acts as the anode when the reaction Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) occurs in an electrochemical cell?
A
Pb2+(aq)
B
Zn(s)
C
Pb(s)
D
Zn2+(aq)
7) The oxidation number of a reducing agent can change from
A
-1 to -3
B
4 to -3
C
3 to -1
D
-2 to -1
8) In the reaction: Pb + 2Ag+ --> Pb2+ + 2Ag, the Ag+ is:
A
oxidized, and the oxidation number changes from +1 to 0
B
reduced, and the oxidation number changes from +1 to 0
C
oxidized, and the oxidation number changes from 0 to +1
D
reduced, and the oxidation number changes from +2 to 0
9) Which is the balanced half-reaction equation for the reduction of Al3+ to Al?
A
Al + 3e- → Al3+
B
Al3+ + 3e- → Al
C
Al → Al3+ + 3e-
D
Al3+ → Al + 3e-
10) In a voltaic cell,reduction occures at:
A
the anode which is negative
B
the cathode which is positive
C
the anode which is positive
D
the cathode which is negative
*select an answer for all questions
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