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2. K2Cr2O7 + 3H2S + 4H2SO4 => K2SO4 + Cr2(SO4)3 + 3S + 7H2O
3. K2Cr2O7 + 3SnCl2 + 14HCl => 2CrCl3 + 3SnCl4 + 2KCl + 7H2O
4. 2CrCl3 + 3Cl2 + 16KOH => 2K2CrO4 + 12KCl + 8H2O