Question

Assertion (A): Antiferromagnetic substances on heating to high temperature become paramagnetic.

Reason (R): On heating, the randomization of spins occurs.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is incorrect
• D. (A) is incorrect but (R) is correct
• E. Both (A) and (R) are incorrect

Answer 1

Answer: (A)

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Assertion (A) : Antiferromagnetic substances on heating to high temperature become paramagnetic.

Reason (R) : On heating, the randomization of spins occurs.

Hence, both (A) and (R) are correct and (R) is the correct explanation of (A).

Paramagnetic substances have permanent magnetic dipoles and are attracted by the magnetic field.

In anti-ferromagnetic substances, the alignment of magnetic moments of domains is in a compensatory way so as to give zero net magnetic moment because of cancellation of the individual magnetic moments.