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Problem
Problem
Passivity of iron is due to formation of : a.
F
e
2
O
3
Fe_2O_3
F
e
2
O
3
b.
F
e
3
O
4
Fe_3O_4
F
e
3
O
4
c.
F
e
S
O
4
FeSO_4
F
e
S
O
4
d. None of these
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