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2
S
^{IV}
O
_{2}
+
O
_{2}
^{0}
→
2
S
^{VI}
O
_{3}
^{II}
S
^{IV}

2
e
^{}
→
S
^{VI}
O
^{0}
+
2
e
^{}
→
O
^{II}
Change the oxidation states
Search by reactants (
S
O
_{2}
,
O
_{2}
)
1.
SO
_{2}
+
O
_{2}
→ SO
_{3}
Search by products (
S
O
_{3}
)
1.
SO
_{2}
+ O
_{2}
→
SO
_{3}
2.
Al
_{2}
(SO
_{3}
)
_{3}
→
SO
_{3}
+ Al
3.
S + O
_{2}
→
SO
_{3}
4.
Fe
_{2}
(SO
_{4}
)
_{3}
→ Fe
_{2}
O
_{3}
+
SO
_{3}
5.
FeS
_{2}
+ O
_{2}
+ N
_{2}
→ Fe
_{2}
O
_{3}
+
SO
_{3}
+ NO
6.
KHSO
_{4}
→ K
_{2}
O +
SO
_{3}
+ H
_{2}
O
7.
Fe(S
_{2}
) + O
_{2}
+ N
_{2}
→ Fe
_{2}
O
_{3}
+
SO
_{3}
+ NO
8.
K
_{2}
SO
_{3}
→ K +
SO
_{3}
9.
Cr
_{2}
O
_{7}
^{2+}
+ SO
_{2}
+ H
_{3}
O
^{+}
→ Cr
^{3+}
+
SO
_{3}
+ H
_{2}
O
Search by reactants (
S
O
_{2}
,
O
_{2}
) and by products (
S
O
_{3}
)
1.
SO
_{2}
+
O
_{2}
→
SO
_{3}