Oxidation Number Exercise Page 3
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Oxidation Number Exercise
Rule 5
Oxygen has an oxidation number of -2. (Note: Your knowledge of the
polyions is now needed. The polyions you are responsible for knowing are on
xiv. Turn to xiv now and become familiar with this chart. Notice that for
the polyions on xiv, the oxidation number for oxygen is -2)
Cautionary Note: Review Rule 0.
Exercises - Give the oxidation number for the following atoms:
Co(ClO)
Co =
Cl =
Na
O
Na =
O =
2
2
2
CoCrO
Cr =
Co =
AgNO
Ag =
N =
4
3
Mg(OH)
Mg =
O =
H
SO
S =
2
2
4
-
RbO
Rb =
O =
ClO
Cl =
2
4
KMnO
Mn =
K =
NH
OH N =
4
4
-
OF
F =
O =
IO
I =
2
3
KO
K =
O =
K
Cr
O
Cr =
2
2
2
7
-
-
IO
I =
BrO
Br =
2
2
Zn(NO
)
Zn =
O =
2
2
Cautionary Note: Review Rule 0 again
Rule 6
Group 17 (old CAS VIIA) atoms have an oxidation number of -1.
Rule 7
Group 16 (old CAS VIA) atoms have an oxidation number of -2.
Rule 8
Group 15 (old CAS VA) atoms have an oxidation number of -3.
Exercises - Give the oxidation number for the following atoms:
-
PH
P =
CH
NH
C =
CN
C =
3
3
2
3-
BF
NH
B =
MnCl
Mn =
W
Cl
W =
3
3
4
2
9
Co
N
Co =
NCl
N =
KSCN
C =
3
2
3
HCN
C =
POCl
P =
V
N
V =
3
3
4
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