____I-+ ____O2+ ____H+→____ I2+ ____;
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____KMnO4+____K2SO3+____ → ____MnO2+____K2SO4+____ KOH;
____MnO4-+____H2C2O4+____H+→ ____Mn2++____CO2+____;
____Cr2O72-+____I-+ ____ → ___Cr3++____I2+____H2O。
( )K2Cr2O7+( )H2SO4+( )C → ( )K2SO4+( )Cr2[SO4]3+( )CO2+( )H2O;