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Cr2O3+KNO3+KOH--->K2CrO4+KNO2+H2O
Cr2O3 + 3 KNO3 + 4 KOH → 2 K2CrO4 + 3 KNO2 + 2 H2O
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Cr2O3 + 3 KNO3 + 4 KOH → 2 K2CrO4 + 3 KNO2 + 2 H2O