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When orange solution containing Cr(2)O(7...

When orange solution containing `Cr_(2)O_(7)^(2-)` ion is treated with an alkali, a yellow solution is formed and when `H^(+)` ions are added to yellow solution, an orange solution is obtained. Explain why does this happen?

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This is due to the following interconversion `:`
`underset("Dischromate (orange)")(Cr_(2)O_(7)^(2-)) underset(H^(+))overset(OH^(-)) (hArr) underset("Chromate(yellow)")(CrO_(4)^(2-))`
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