Which series of reactions correctly represents chemical rections related to iron and its compounds ?
A. `Feoverset("dil. "H_(2)SO_(4))toFeSO_(4)overset(H_(2)SO_(4).O_(2))toFe_(2)(SO_(4))_(3)overset(heat)toFe`
B. `Fe(O_(2),heat)toFeO(dil." "H_(2)SO_(4))toFeSO_(4)overset(heat)toFe`
C. `Feoverset(Cl_(2)," heat")toFeCl_(3)overset("heat, air")toFeCl_(2)overset(Zn)toFe`
D. `Feoverset(O_(2)," "heat)toFe_(3)O_(4)overset("CO, "600^(@)C)toFeOoverset("CO, "700^(@)C)toFe`
