$C r O_{3}$ dissoloves in aqueous NaOH to give :

$C r_{2} O_{7}^{2 -}$

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$C r O_{4}^{2 -}$

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$C r (O H)_{3}$

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$C r (O H)_{2}$

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Solution

The correct option is B
$C r O_{4}^{2 -}$

Chromate ion exists in alkaline medium

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