A few substances like iron, cobalt, nickel, gadolinium and CrO2 are attracted very strongly by a magnetic field. Such substances are called ferromagnetic substances.Besides strong attractions, these substances can be permanently magnetized. In solid state, the metal ions of ferromagnetic substances are grouped together into small regions called domains. Thus, each domain acts as a tiny magnet. In an unmagnetized piece of a ferromagnetic substance the domains are randomly oriented and their magnetic moments get cancelled.

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Gadolinium is

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Ferromagnetic

Anti ferromagnetic

Ferrimagnetic

Diamagnetic

answer is A.

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Detailed Solution

A few substances like iron, cobalt, nickel, gadolinium and CrO₂ are attracted very strongly by a magnetic field.
Such substances are called ferromagnetic substances.
Besides strong attractions, these substances can be permanently magnetized.
In solid state, the metal ions of ferromagnetic substances are grouped together into small regions called domains.
Thus, each domain acts as a tiny magnet.
In an unmagnetized piece of a ferromagnetic substance the domains are randomly oriented and their magnetic moments get cancelled.

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