FeCr2O4+Na2CO3+O2⟶X+Y+CO2 Mention X and Y.
X=Na2Cr2O7;Y=Fe3O4
X=Na2Cr2O4;Y=Fe3O4
X=Na2CrO4;Y=Fe2O3
X=Na2Cr2O7;Y=Fe3O3
X+H+⟶Y+Na++H2O
Y+KCl⟶K2Cr2O7+NaCl Find X and Y.