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JIPMER2018Chemistryd and f Block Elements

Among the following species, the one which become paramagnetic on heating at 850 K is

Options

  1. AFe ₃ O ₄
  2. BMnO
  3. CZnFe ₂ O ₄
  4. DBoth (a) and (c)

Correct answer

D. Both (a) and (c)

Step-by-step solution

All magnetically ordered solids, i.e. ferromagnetic; antiferromagnetic; ferrimagnetic changes to paramagnetic state at high temperature because of the randomisation of spins. Ferrimagnetic species, such as Fe ₃ O ₄ (magnetite) and ferrites, i.e. MgFe ₂ O ₄ and ZnFe ₂ O ₄ loses ferrimagnetism on heating and transforms to paramagnetism.

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