A) III in haematite and II and III in magnetite
B) II and III in haematite and II in magnetite
C) II and III in haematite and III in magnetite
D) II in haematite and III in magnetite
Correct Answer: A
Solution :
Hematite \[(F{{e}_{2}}{{O}_{3}});Fe=+3\] Magnetite \[(F{{e}_{3}}{{O}_{4}}=FeO+F{{e}_{2}}{{O}_{3}});\] \[Fe=+2\]and \[+3\]
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