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Worksheetsoxidation number
Total questions: 10
Worksheet time: 9mins
Name
Class
Date
1.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
2.
The sum of all oxidation numbers in a neutral compound is ___.
a)
0
b)
1
c)
-1
d)
depends on the compound
3.
What is oxidation number of Cr in
Cr2O72-?
Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
4.
What are oxidation numbers?
a)
Number of electrons in the outer most energy level
b)
Number of protons
c)
Electrons gained or lost in chemical bonding
d)
Number of neutrons gained or lost
5.
Oxidation number of O in its stable elemental form, O2:
a)
0
b)
-1
c)
-2
d)
+2
6.
Oxidation number of Fe in Fe2+ ion:
a)
0
b)
-2
c)
+2
d)
+3
7.
What is the charge, or oxidation number, for elements in Group 2?
a)
-2
b)
+2
c)
-3
8.
What is the oxidation state of Cl in ClO- ?
a)
0
b)
+1
c)
-1
d)
+2
9.
C in CO32-?
a)
-4
b)
+2
c)
0
d)
+4
10.
Determine the oxidation numbers and Valence Electrons for Br.
a)
-1, 7
b)
+3, 2
c)
-1, 3
d)
+7, 3
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