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

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

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

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

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3 p^{6} 4 s^{2}

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Solution

The correct option is A $4 s^{0} 3 d^{4}$
Electronic configuration of chromium
$C r \to [A r] 3 d^{5} 4 s^{1}$
$C r^{2 +} \to [A r] 3 d^{4} 4 s^{0} .$

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