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W reakcji jest błąd powinna on wyglądać tak:
K2Cr2O7 + 3SnCl2 +14HCl --> 2CrCl3 + 3SnCl4 + 2KCl + 7H2O
2Cr(+VI) + 6e------>2Cr(+III)
3Sn(+II) - 6e------>3Sn(+IV)