Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

In the light of the given statements, choose the correct answer from the options given.

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

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

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

Magnetic susceptibility of diamagnetic materials is independent of temperature and thus the graph will be parallel to T- axis.

Diamagnetic behaviour of materials arises due to the paired spins of electrons in the material. When such materials are placed in an external magnetic field, they are repelled due to their inner fields.When we increase the temperature of a diamagnetic substance, there is not much effect on the susceptibility. The paired spins remain unaffected by the increase in inter-atomic vibrations as a very large amount of energy is required to break apart paired electrons which are in their ground state when paired. So, the susceptibility is basically unaffected with change in temperature for a diamagnetic substance.

Therefore the reason is true and is the correct explanation for the assertion given.

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