Ferrimagnetism is observed by (a) \( \mathrm{Fe}_{3} \mathrm{O}_{4} \) and \( \mathrm{MgFe}_{2} ...

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Ferrimagnetism is observed by
(a) \( \mathrm{Fe}_{3} \mathrm{O}_{4} \) and \( \mathrm{MgFe}_{2} \mathrm{O}_{4} \)
(b) \( \mathrm{MnO} \) and \( \mathrm{MnO}_{3} \)
(c) \( \mathrm{CrO}_{2} \) and \( \mathrm{Gd} \)
(d) \( \mathrm{O}_{2} \) and \( \mathrm{Cu}^{2+} \)
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