Write a Balanced Half-Reaction for the Reduction of CrO₄^2-(aq) to Cr(OH)₃(s)

question 57

Multiple Choice

Write a balanced half-reaction for the reduction of CrO₄^2-(aq) to Cr(OH) ₃(s) in a basic solution.

• A) CrO₄^2-(aq) + 3 OH^-(aq) + 3 e^- ? Cr(OH)₃(s) + 2 O₂(g)
• B) CrO₄^2-(aq) + 3 H⁺(aq) + 3 e^- ? Cr(OH)₃(s)
• C) CrO₄^2-(aq) + 3 H⁺(aq) ? Cr(OH)₃(s) + 2 e^-
• D) CrO₄^2-(aq) + 4 H₂O( \(\ell\) ) + 3 e^- ? Cr(OH)₃(s) + 5 OH^-(aq)
• E) CrO₄^2-(aq) + 3 OH^-(aq) ? Cr(OH)₃(s) + 2 O₂(g)

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