Question

Given below are two statements:

Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.

Statement II: The number of unpaired electrons in a Cr²⁺ ion (Z = 24) is the same as that of a Nd³⁺ ion (Z = 60).

In the light of the above statements, choose the correct answer from the options given below:

Options

• Both Statement I and Statement II are true.

• Both Statement I and Statement II are false.

• Statement I is true but Statement II is false.

• Statement I is false but Statement II is true.

Answer 1

Statement I is true but Statement II is false.

Explanation:

Statement I is correct, because ferromagnetism is an extreme kind of paramagnetism. Ferromagnetism is characterised by a more structured alignment of magnetic moments within a material, resulting in strong and persistent magnetism. Paramagnetism is a weaker kind of magnetism that requires an external magnetic field for alignment.

Statement II is incorrect because the outermost electronic configuration of:

Cr⁺² = 3d⁴. Number of unpaired electrons = 4.

Nd⁺³ = 4f³. Number of unpaired electrons = 3.