Which of the following statement is not true

a. Paramagnetic substances are weakly attracted by magnetic field

b. Ferromagnetic substances cannot be magnetised

c. The domains in antiferromagnetic substances are oppositely oriented with respect to each other

d. Pairing of electrons cancels their magnetic moment in the diamagnetic substances.

Ans. b

Explanation : Forromagnetic susbtances can be magnetised by applying magnetic field to it and magnetic property persist within it even after removal of magnetic field