Easy
The order of stability of metal oxides is:
- A$Fe_{2}O_{3} < Cr_{2}O_{3} < Al_{2}O_{3} < MgO$
- B$Cr_{2}O_{3} < MgO < Al_{2}O_{3} < Fe_{2}O_{3}$
- C$MgO < Al_{2}O_{3} < Cr_{2}O_{3} < Fe_{2}O_{3}$
- D$Fe_{2}O_{3} < Al_{2}O_{3} < Cr_{2}O_{3} < MgO$
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