Question

Reason
Every atom of a diamagnetic material is not a complete magnet in itself.
Assertion
The susceptibility of diamagnetic materials does not depend upon temperature.

Answer 1

Correct option is C. Assertion is correct but Reason is incorrect

Diamagnetism is non-cooperative behaviour of orbiting electrons when exposed to an applied magnetic field. Diamagnetic substance are composed of atom which have no net magnetic moment (i.e., all the orbital shells are filled and there are no unpaired electrons). When exposed to a field, a negative magnetization is produced and thus the susceptibility is negative

Behaviour of diamagnetic material is that the susceptibility is temperature independent.