Among the following series of transition metal ions, the one in which all metals ions have $3…

Among the following series of transition metal ions, the one in which all metals ions have $3 \mathrm{d}^{2}$ electronic configuration is
  1. $\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}$
  2. $\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}, \mathrm{Mn}^{5+}$
  3. $\mathrm{Ti}^{3+}, \mathrm{V}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Mn}^{4+}$
  4. $\mathrm{Ti}^{+}, \mathrm{V}^{4+}, \mathrm{Cr}^{6+}, \mathrm{Mn}^{7+}$

Solution

$T i_{22}=3 d^{2} ~4 s^{2} ; T i^{2+}=3 d^{2}$
$V_{23}=3 d^{3} ~4 s^{2} ; V^{3+}=3 d^{2}$
$C r_{24}=3 d^{4} ~4 s^{2} ; C r^{4+}=3 d^{2}$
$M n_{25}=3 d^{5} ~4 s^{2} ; M n^{5+}=3 d^{2}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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