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?
H
2
S
O
4
+
?
S
+
?
K
2
Cr
2
O
7
→
?
H
2
O
+
?
K
2
S
O
4
+
?
S
O
2
+
?
Cr
2
(
S
O
4
)
3
Error: Error in balancing the equation: There is an infinite amount of solutions.