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WorksheetsRedox Reactions
Total questions: 10
Worksheet time: 9mins
Name
Class
Date
1.
Is calcium oxidized or reduced in the following reaction?
2 CaO--> 2 Ca + O2
2 CaO--> 2 Ca + O2
a)
Oxidized
b)
Reduced
2.
Which of the following half reactions correctly represents a reduction half reaction?
a)
Fe →Fe2+ + 2e-
b)
Pb4+ + 2e- →Pb2+
c)
2O-2 →O2 + 4e-
d)
Fe + 3e- →Fe3+
3.
Reduction is the ___________ of electrons.
a)
loss
b)
gain
c)
sharing
d)
transfer
4.
Which of the following represents oxidation?
a)
C → CH4
b)
Fe3+ → Fe2+
c)
Cl2 → 2Cl-
d)
Zn → ZnO
5.
In the reaction Zn + 2HCl --> ZnCl2 + H2
which element, if any, is oxidized?
a)
Zinc
b)
Hydrogen
c)
Chlorine
d)
None
6.
Which statement is true:
Mg → Mg2+ + 2e–
Mg → Mg2+ + 2e–
a)
Mg gains 2 electrons
b)
Mg2+ loses 2 electrons
c)
Mg loses 1 electron
d)
Mg loses 2 electrons
7.
The following chemical equation represents the extraction of silicon from quartz using coke.
SiO2 + C → Si + CO2
What is the change in oxidation number of silicon?
a)
+2 to 0
b)
+4 to 0
c)
0 to +2
d)
0 to +4
8.
charge on cation is
(a)
9.
Which of the following cannot occur during oxidation?
a)
Gain of oxygen
b)
Donation of electrons
c)
Loss of hydrogen
d)
Decrease in oxidation number
10.
What is the oxidation number of oxygen in oxygen gas, O2 ?
a)
-2
b)
0
c)
-1
d)
+1
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