A) \[F{{e}_{2}}{{O}_{3}},F{{e}_{3}}{{O}_{4}}\]
B) \[F{{e}_{3}}{{O}_{4}},C{{r}_{2}}{{O}_{3}}\]
C) \[Cr{{O}_{2}},F{{e}_{3}}{{O}_{4}}\]
D) \[C{{r}_{2}}{{O}_{3}},Cr{{O}_{2}}\]
Correct Answer: C
Solution :
[c] \[F{{e}^{3+}},C{{r}^{3+}}\]shows paramagnetism whereas \[Cr{{O}_{2}}\]is attracted very strongly by a magnetic field but \[F{{e}_{3}}{{O}_{4}}\](magnetic) is weakly attracted by magnetic field and hence show ferrimagnetism.
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