MCQ
Which of the following have the same number of unpaired electrons in $‘d’$ orbitals
- A$Cr$
- B$Mn$
- C$Fe^{3+}$
- ✓$A$ , $B$ or $C$
✓
Answer
Correct option: D.
$A$ , $B$ or $C$
d
(d) $Cr$, $Mn$ and $F{e^{3 + }}$ have $5$ unpaired electron in $d- $orbitals.
(d) $Cr$, $Mn$ and $F{e^{3 + }}$ have $5$ unpaired electron in $d- $orbitals.
$_{24}Cr = 3{d^5}\,4{s^1} = 5$
$_{25}Mn = 3{d^5}\,4{s^2} = 5$
$_{26}Fe_{}^{3 + } = 3{d^5}4{s^0} = 5$
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