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WAEC Chemistry 2017 Paper
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© africaexams.com
Question : 15
Total: 50
The oxidation number of X in
X
O
4
3
−
is
+1
+3
+4
+5
Validate
Solution:
X
O
4
3
+
=
X
+
(
−
2
×
4
)
=
−
3
X
=
−
3
+
8
=
+
5
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