9. The most abundant natural Iron oxides are

a) Magnetite and Pyrite
b) Magnetite and Bauxite
c) Hematite and Pyrite
d) Hematite and Magnetite
e) Hematite and Bauxite

well the correct choice is choice ''d''

pyrite--- sulphide of iron not the oxide
Bauxite --- belong to aluminium not iron

and magnetite(fe3o4) and hematite(fe2o3) are both oxides of iron

so the correct choice is d