A few substances are attracted very strongly by magnetic field. They…

The correct answer is Option (2) → Ferromagnetic

All three clues of the question (very strong attraction, permanent magnetisation, domains that stay aligned after the field is removed) describe a ferromagnetic substance such as iron, cobalt or nickel.

Why the other options are incorrect

• Option (1) Paramagnetic — Incorrect. Weakly attracted (\( \ce{O2} \), \( \ce{Cu^{2+}} \)) and lose their magnetism when the field is removed.

• Option (3) Antiferromagnetic — Incorrect. Domains are aligned in opposite directions and cancel, so the net magnetic moment is zero (MnO).

• Option (4) Ferrimagnetic — Incorrect. Domains are aligned in opposite directions in unequal numbers, giving a small net moment (\( \ce{Fe3O4} \)); they are weakly attracted, much less than ferromagnets.

Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.

NCERT (Pre-rationalised edition, 2022-23):
Ferromagnetism – “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 magnetised. 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 unmagnetised piece of a ferromagnetic substance the domains are randomly oriented and their magnetic moments get cancelled. When the substance is placed in a magnetic field all the domains get oriented in the direction of the magnetic field and a strong magnetic effect is produced. This ordering of domains persist even when the magnetic field is removed and the ferromagnetic substance becomes a permanent magnet.”