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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 the yellow solution, an orange solution is obtained. Explain why does this happen ?

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Dichromate change to chromate in alkaline medium, while chromate changes to dichromate in acid medium.
`Cr_(2)O_(7)^(2-)("orange")overset(OH^(-))underset(H^(+))hArr CrO_(4)^(2-)("yellow")`
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -SOLVED NCERT EXEMPLAR PROBLEMS (Short Answer Type)
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