(i) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic.

(ii) Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic.

(iii) Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not cancelled by each other.

(iv) In ferromagnetic substances, all the domains get oriented in the direction of the magnetic field and remain as such even after removing magnetic field.

Correct Answers:

(i) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic.

(iv) In ferromagnetic substances, all the domains get oriented in the direction of the magnetic field and remain as such even after removing magnetic field.

Explanation:  Ferrimagnetic substances lose ferrimagnetism on heating and do not have domain structures similar to ferromagnetic substances and their magnetic moments are cancelled by each other.