The chromate ion in acidic medium changes to ..............

C r O_{4}^{- 2}

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_{3}

_{10}^{- 2}

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_{2}

_{7}^{- 2}

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none of these

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Solution

The correct option is C Cr $_{2}$ O $_{7}^{- 2}$
Option (C) is correct.
The chromate ion (yellow colour) in acidic medium changes to dichromate ion $C r_{2} O_{7}^{2 -}$ (orange - red colour). In alkaline medium, reverse happens.
In solution,the dichromate ions convert to chromate ions by the action of a base. Thus chromate ion and dichromate ion exists in equilibrium.

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