Q73 / 200 · NEET 2004 · Chemistry

Among the following series of transition metal ions, the one where all metal ions have $3 d^2$ electronic configuration is: [At. no.s $\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24, \mathrm{Mn}=$ 25]

  • A
    $\mathrm{Ti}^{3+}, \mathrm{V}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Mn}^{4+}$
  • B
    $\mathrm{Ti}^{+}, \mathrm{V}^{4+}, \mathrm{Cr}^{6+}, \mathrm{Mn}^{7+}$
  • C
    $\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}$
  • Correct answer
    D
    $\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}, \mathrm{Mn}^{5+}$

Solution

$$ \begin{aligned} \mathrm{Ti}_{22} & =3 d^2 4 s^2 ; & \mathrm{Ti}^{2+} & =3 d^2 \\ \mathrm{~V}_{23} & =3 d^3 4 s^2 ; & \mathrm{V}^{3+} & =3 d^2 \\ \mathrm{Cr}_{24} & =3 d^4 4 s^2 ; & \mathrm{Cr}^{4+} & =3 d^2 \\ \mathrm{Mn}_{25} & =3 d^5 4 s^2 ; & \mathrm{Mn}^{5+} & =3 d^2 \end{aligned} $$ Related Theory $\mathrm{Mn}^{2+}$ has the maximum number of unpaired electrons (5) and hence has the maximum magnetic moment.

Hence, the correct answer is option: 'D'.

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