$F e$ , $C o$ , $N i$ are ___________ substances.

Paramagnetic

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Ferromagnetic

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Diamagnetic

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Anti-ferromagnetic

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Solution

The correct option is B Ferromagnetic
$F e, C o, N i$ are ferromagnetic substances. They are attracted by magnetic field and show permanent magnetism even in absence of magnetic field.

Ferromagnetism arises due to spontaneous alignment of magnetic momenta in the same direction.

Hence, the correct answer is option $B$ .

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