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Q.

The valence shell electronic configuration of ${Cr}^{2 +}$ ion is

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a

$3 p^{2} 4 s^{2}$

b

$4 s^{2} 3 d^{2}$

c

$4 s^{2} 3 d^{0}$

d

$4 s^{0} 3 d^{4}$

answer is D.

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Detailed Solution

Electronic configuration of chromium

$\begin{array}{l} Cr \to [Ar] 3 d^{5} 4 s^{1} \\ {Cr}^{2 +} \to [Ar] 3 d^{4} 4 s^{0} \end{array}$

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