Which of the following has the maximum number of unpaired… — JEE Main 1996 Chemistry PYQ

1996

Which of the following has the maximum number of unpaired electrons?

A.
$\text{Mg}^{2+}$
B.
$\text{Ti}^{3+}$
C.
$\text{V}^{3+}$
D.
$\text{Fe}^{2+}$

Show answer and solution

Correct option: D

Solution

Fe²⁺ has configuration [Ar] 3d⁶. By Hund's rule, 6 electrons in 5 d-orbitals give 4 unpaired electrons. For comparison: Mg²⁺ has 0 unpaired, Ti³⁺ (3d¹) has 1, V³⁺ (3d²) has 2. Fe²⁺ with 4 unpaired electrons is the maximum.

[1996]

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