Cr_2O_7^{2-} underset{Y}{overset{X}{longleftr | vedclass

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Question

(A) The interconversion between dichromate $(Cr_2O_7^{2-})$ and chromate $(CrO_4^{2-})$ ions is pH dependent.In an alkaline medium $(OH^{-})$,the dich

Vedclass · Accepted Answer

$X = OH^{-}, Y = H^{+}$

Vedclass · Answer

(A) The interconversion between dichromate $(Cr_2O_7^{2-})$ and chromate $(CrO_4^{2-})$ ions is pH dependent.In an alkaline medium $(OH^{-})$,the dichromate ion is converted into the chromate ion: $Cr_2O_7^{2-} + 2OH^{-} \rightarrow 2CrO_4^{2-} + H_2O$.In an acidic medium $(H^{+})$,the chromate ion is converted into the dichromate ion: $2CrO_4^{2-} + 2H^{+} \rightarrow Cr_2O_7^{2-} + H_2O$.Therefore,for the reaction $Cr_2O_7^{2-} \xrightarrow{X} 2CrO_4^{2-}$,$X$ must be $OH^{-}$.For the reverse reaction $2CrO_4^{2-} \xrightarrow{Y} Cr_2O_7^{2-}$,$Y$ must be $H^{+}$.Thus,$X = OH^{-}$ and $Y = H^{+}$.

$Cr_2O_7^{2-} \underset{Y}{\overset{X}{\longleftrightarrow}} 2CrO_4^{2-}$,$X$ and $Y$ are respectively

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