The isoelectronic pair of ions is

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Question

(b)
The isoclectronic species are those species which have same number of electrons.
$(a)$ $Sc ^{2+}$ and $V ^{3+}$
Number of electrons in $Sc ^{2+

Vedclass · Accepted Answer

$Mn ^{2+}$ and $Fe ^{3+}$

Vedclass · Answer

(b)
The isoclectronic species are those species which have same number of electrons.
$(a)$ $Sc ^{2+}$ and $V ^{3+}$
Number of electrons in $Sc ^{2+}=19$
Number of electrons in $V ^{3+}=21$
$(b)$ $Mn ^{2+}$ and $Fe ^{3+}$
Number of electrons in $Mn ^{2+}=23$
Number of electrons in $Fe ^{3+}=23$
$(c)$ $Mn ^{3+}$ and $Fe ^{2+}$
Number of electrons in $Mn ^{3+}=22$
Number of electrons in $Fe ^{2+}=24$
$(d)$ $Ni ^{3-}$ and $Fe ^{2-}$
Number of electrons in $Ni ^{3-}=31$
Number of electrons in $Fe ^{2-}=28$
Thus, $Mn ^{2+}$ and $Fe ^{3+}$ are isoelectronic pair and hence the correct option is $(b).$

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