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H
_{2}
O
_{2}
^{I}
+
2
K
I
^{I}
+
H
_{2}
S
O
_{4}
→
I
_{2}
^{0}
+
K
_{2}
S
O
_{4}
^{II}
+
2
H
_{2}
O
O
^{I}
+
e
^{}
→
O
^{II}
I
^{I}

1
e
^{}
→
I
^{0}
Change the oxidation states
Search by reactants (
H
_{2}
O
_{2}
,
K
I
,
H
_{2}
S
O
_{4}
)
1.
H
_{2}
O
_{2}
+
KI
+
H
_{2}
SO
_{4}
→ I
_{2}
+ K
_{2}
SO
_{4}
+ H
_{2}
O
Search by products (
I
_{2}
,
K
_{2}
S
O
_{4}
,
H
_{2}
O
)
1
2
1.
K
_{2}
Cr
_{2}
O
_{7}
+ KI + H
_{2}
SO
_{4}
→
K
_{2}
SO
_{4}
+ Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
H
_{2}
O
2.
KMnO
_{4}
+ KI + H
_{2}
SO
_{4}
→ MnSO
_{4}
+
K
_{2}
SO
_{4}
+
I
_{2}
+
H
_{2}
O
3.
H
_{2}
O
_{2}
+ KI + H
_{2}
SO
_{4}
→
I
_{2}
+
K
_{2}
SO
_{4}
+
H
_{2}
O
4.
KClO
_{3}
+ KI + H
_{2}
SO
_{4}
→
K
_{2}
SO
_{4}
+ KCl +
I
_{2}
+
H
_{2}
O
5.
K
_{2}
Cr
_{2}
O
_{7}
+ HI + H
_{2}
SO
_{4}
→
K
_{2}
SO
_{4}
+ Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
H
_{2}
O
6.
KI + KIO
_{3}
+ H
_{2}
SO
_{4}
→
I
_{2}
+
K
_{2}
SO
_{4}
+
H
_{2}
O
7.
KI + H
_{2}
SO
_{4}
→
I
_{2}
+
K
_{2}
SO
_{4}
+ H
_{2}
S +
H
_{2}
O
8.
NaNO
_{2}
+ KI + H
_{2}
SO
_{4}
→ NO +
I
_{2}
+
K
_{2}
SO
_{4}
+ Na
_{2}
SO
_{4}
+
H
_{2}
O
9.
K
_{2}
Cr
_{2}
O
_{7}
+ NaI + H
_{2}
SO
_{4}
→ Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
K
_{2}
SO
_{4}
+ Na
_{2}
SO
_{4}
+
H
_{2}
O
10.
KIO
_{4}
+ KI + H
_{2}
SO
_{4}
→
I
_{2}
+
K
_{2}
SO
_{4}
+
H
_{2}
O
1
2
Search by reactants (
H
_{2}
O
_{2}
,
K
I
,
H
_{2}
S
O
_{4}
) and by products (
I
_{2}
,
K
_{2}
S
O
_{4}
,
H
_{2}
O
)
1.
H
_{2}
O
_{2}
+
KI
+
H
_{2}
SO
_{4}
→
I
_{2}
+
K
_{2}
SO
_{4}
+
H
_{2}
O