SATHEE: D-And F-Block Elements Ques 424

D-And F-Block Elements Ques 424

Question: Which of the following have maximum number of unpaired electrons

[BHU 2005]

Options:

A) $F e^{3 +}$

B) $F e^{2 +}$

C) $C o^{2 +}$

D) $C o^{3 +}$

Show Answer

Answer:

Correct Answer: A

Solution:

$F e^{3 +}$ $\to$ [Ar] $3 d^{6} 4 s^{0}$ , number of unpaired electrons = 5

$F e^{2 +}$ $\to$ [Ar] $3 d^{6} 4 s^{0}$ , number of unpaired electrons = 4

$C o^{2 +}$ $\to$ [Ar] $3 d^{7} 4 s^{0}$ , number of unpaired electrons = 3

$C o^{3 +}$ $\to$ [Ar] $3 d^{6} 4 s^{0},$ number of unpaired electrons = 4

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