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Cr2O7(2-) + 14H(+) + 6e --> 2Cr(3+) + 7H2O |*1
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3SO2 + 6H2O + Cr2O7(2-) + 14H(+) + 6e --> 2Cr(3+) + 7H2O + 3SO4(2-) + 12H(+) + 6e
3SO2 + Cr2O7(2-) + 2H(+) --> 2Cr(3+) + H2O + 3SO4(2-)