The reversible interconversion between the yellow chromate () and orange dichromate () ions is heavi — d and f Block Elements Chemistry Question
Question
The reversible interconversion between the yellow chromate ($CrO_4^{2-}$) and orange dichromate ($Cr_2O_7^{2-}$) ions is heavily dependent on the $pH$ of the surrounding aqueous solution. Which of the following statements chemically describe this dynamic equilibrium system?
Answer: A,C,D
💡 Solution & Explanation
The equilibrium is: $2CrO_4^{2-} + 2H^+ \rightleftharpoons Cr_2O_7^{2-} + H_2O$. Adding acid ($H^+$) pushes the reaction right, forming orange dichromate. Adding alkali ($OH^-$) neutralizes the $H^+$, pulling the reaction left, forming yellow chromate. Critically, this is strictly not a redox reaction; Chromium remains entirely in the $+6$ oxidation state in both structural forms.
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