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JEE Main levelSingle correct optionDifficulty 2 of 3ss033

A ferromagnetic solid becomes paramagnetic above its Curie temperature because

Ait loses all its unpaired electrons
Bits electrons become paired
Cthe crystal structure changes to amorphous
Dthermal agitation destroys the alignment of the magnetic domains

Answer: D

Below the Curie temperature the spins in each domain are aligned in the same direction. Above it, thermal motion randomises the moments, so only ordinary paramagnetism remains; unpaired electrons are still present.

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