The isoelectronic pair of ions is

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(B) Isoelectronic species are those that have the same number of electrons.$(a)$ $Sc^{2+}$ ($Z=21$,$21-2=19$ electrons) and $V^{3+}$ ($Z=23$,$23-3=20$

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

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(B) Isoelectronic species are those that have the same number of electrons.$(a)$ $Sc^{2+}$ ($Z=21$,$21-2=19$ electrons) and $V^{3+}$ ($Z=23$,$23-3=20$ electrons).$(b)$ $Mn^{2+}$ ($Z=25$,$25-2=23$ electrons) and $Fe^{3+}$ ($Z=26$,$26-3=23$ electrons).$(c)$ $Mn^{3+}$ ($Z=25$,$25-3=22$ electrons) and $Fe^{2+}$ ($Z=26$,$26-2=24$ electrons).$(d)$ $Ni^{3+}$ ($Z=28$,$28-3=25$ electrons) and $Fe^{2+}$ ($Z=26$,$26-2=24$ electrons).Thus,$Mn^{2+}$ and $Fe^{3+}$ have the same number of electrons and form an isoelectronic pair. The correct option is $(b)$.

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