The D And F Block Elements Ques 19
19. Among the following series of transition metal ions, the one where all metal ions have $3 d^{2}$ electronic configuration is (At. nos. $Ti=22$; $V=23 ; Cr=24 ; Mn=25$ )
[2004]
(a) $Ti^{3+}, V^{2+}, Cr^{3+}, Mn^{4+}$
(b) $Ti^{+}, V^{4+}, Cr^{6+}, Mn^{7+}$
(c) $Ti^{4+}, V^{3+}, Cr^{2+}, Mn^{3+}$
(d) $Ti^{2+}, V^{3+}, Cr^{4+}, Mn^{5+}$
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Solution:
- (d) The electronic configuration of different species given in the option (d) are:
$ \begin{aligned} & Ti^{2+}: 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2} \\ & V^{3+}: 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2} \\ & Cr^{4+}: 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2} \\ & Mn^{5+}: 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2} \end{aligned} $
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