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The equilibrium Cr(2)O(7)^(2-)hArr 2CrO(...

The equilibrium `Cr_(2)O_(7)^(2-)hArr 2CrO_(4)^(2-)`

A

an acidic medium

B

an alkaline medium

C

a netural medium

D

It does not shift.

Text Solution

Verified by Experts

The correct Answer is:
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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