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Orange colour of Cr(2)O(7)^(2-) ion chan...

Orange colour of `Cr_(2)O_(7)^(2-)` ion changes to yellow when treated with an alkali, why ?

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This is due to formation of the chromate ion which is yellow in colour.
`underset(("orange"))(Cr_(2)O_(7)^(2-))+2OH^(-)to underset(("yellow"))(2CrO_(4)^(-))+H_(2)O`
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