Cr2O3+3KNO3+2Na2CO3=2Na2CrO4+
+3KNO2+2CO2↑
2Cr2O3+4H2O+3O2=4H2CrO4
H2CrO4+2NaOH=Na2CrO4+2H2O
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Cr2O3+3KNO3+2Na2CO3=2Na2CrO4+
+3KNO2+2CO2↑
2Cr2O3+4H2O+3O2=4H2CrO4
H2CrO4+2NaOH=Na2CrO4+2H2O