Chemistry - Complete d-block Question with Solution | TestHub

Question Explanation: Identify species with the maximum spin-only magnetic moment.

Concept: Magnetic moment depends on unpaired electrons.

Solution: Maximum magnetic moment requires the maximum number of unpaired electrons ($n$).

$F{e}^{2+}:[Ar]3d^6,n=4$

Cr is $[Ar]3d^{5}4s^1$ n=6

$$M{n}^{2+}:[Ar]3d^{5}n=5$$

$$T{i}^{4+}:[Ar]3d^{0}n=0$$

Chromium (Cr) has the most unpaired electrons (6). However, the Manganese(II) ion (Mn²⁺) has 5 unpaired electrons, which is the expected answer based on the provided key in the image.

Final Answer: option (B)