The equilibrium between the yellow chromate ion () and the orange dichromate ion () is dictated by p — d and f Block Elements Chemistry Question
Question
The equilibrium between the yellow chromate ion ($CrO_4^{2-}$) and the orange dichromate ion ($Cr_2O_7^{2-}$) is dictated by pH. Which of the following statements is accurate regarding this interconversion?
Answer: B
💡 Solution & Explanation
The equilibrium is $2CrO_4^{2-} + 2H^+ \rightleftharpoons Cr_2O_7^{2-} + H_2O$. This is a purely structural acid-base shift; NO redox occurs (Cr is $+6$ in both). Adding alkali removes $H^+$, pulling the reaction left to yellow chromate.
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