Chromate and dichromate ions are:

C r O_{4}^{2 -}

and

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

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

and

C r O_{4}^{2 -}

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C r O_{4}^{2 -}

and

C r_{2} O_{5}^{2 -}

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C r_{2} O_{5}^{2 -}

and

C r O_{4}^{2 -}

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Solution

The correct option is A $C r O_{4}^{2 -}$ and $C r_{2} O_{7}^{2 -}$
(i) Chromate ion $⟶ C r O_{4}^{2 -}$
(Refer to Image 1)
One chromium atom combined to $4$ oxygen atom.
(ii) Dichromate ion $⟶ C r_{2} O_{7}^{2 -}$
(Refer to Image 2)
Two chromium and $7$ oxygen atom.

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Similar questions

C r_{2} O_{7}^{2 -} p H = x \to C r O_{4}^{2 -} p H = y \to C r_{2} O_{7}^{2 -}

C O_{2}

C r O_{4}^{2 -}

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

C r O_{4}^{2 -} (a q) C O_{2} - - \to C r_{2} O_{7}^{2 -}

C r_{2} O_{7}^{2 -} p H = x - -- \to C r O_{4}^{2 -} p H = y - -- \to C r_{2} O_{7}^{2 -}

p H

x

y

C r_{2} O_{7}^{2 -} p H = x - -- \to C r O_{4}^{2 -} p H = y - -- \to C r_{2} O_{7}^{2 -}

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

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