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Magnetic oxide of iron is

$ (a)\;Fe_2O_3 \\(b)\;FeO\\(c)\; Fe_3O_4 \\ (d)\;Fe_4O_6 $
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It is ferrous ferric oxide of iron and exhibits permanent magnetism.
Hence c is the correct answer.
answered Mar 20, 2014 by meena.p
 

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