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JIPMER 2018
Exam
JIPMER
Year
2018
Subject
Chemistry
Chapter
d and f Block Elements

JIPMER 2018 · Chemistry · d and f Block Elements

Among the following species, the one which become paramagnetic on...

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

Options

  1. AFe3O4\mathrm{Fe}_3 \mathrm{O}_4
  2. BMnOMnO
  3. CZnFe2O4\mathrm{ZnFe}_2 \mathrm{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 Fe3O4\mathrm{Fe}_3 \mathrm{O}_4 (magnetite) and ferrites, i.e. MgFe2O4\mathrm{MgFe}_2 \mathrm{O}_4 and ZnFe2O4\mathrm{ZnFe}_2 \mathrm{O}_4 loses ferrimagnetism on heating and transforms to paramagnetism.
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