InterviewSolution
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InterviewSolution
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The equilibrium `Cr_(2)O_(7)^(2-)hArr 2CrO_(4)^(2-)`A. an acidic mediumB. an alkaline mediumC. a netural mediumD. It does not shift. |
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Answer» Correct Answer - A The addition of an acid to an aqueous solution of a chromate ion, `CrO_(4)^(2-)`, results in the elmination of water and the formation of a condensed anion - the dichromate anion `Cr_(2)O_(7)^(2-)`. The colour of the solution changes form yellow (the color of `CrO_(4)^(2-)`) to orange (the color of `Cr_(2)O_(7)^(2-)`). The reaction is easily reversed by adding alkai`(OH^(-)` ions): `underset("Yellow")(2CrO_(4)^(2-)) (aq) + 2H^(+) (aq)hArr(aq) + H_(2)O (1)` |
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