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Fe3O4 is ferrimagnetic at room temperature but at 850 K it becomes

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a

diamagnetic

b

ferromagnetic

c

non-magnetic

d

paramagnetic

answer is D.

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Detailed Solution

At room temperature in its crystal magnetic number of Fe(II) and Fe(III) ions are unequal in magnitude and aligned in antiparallel direction. But when heated at 850K the arrangement randomised and substance becomes paramagnetic

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Fe3O4 is ferrimagnetic at room temperature but at 850 K it becomes