In the Two Half-Reactions Shown Below,which Chromium Species Is the Strongest

question 179

Multiple Choice

In the two half-reactions shown below,which chromium species is the strongest oxidizing agent? Cr₂O₇^2-(aq) + 14 H⁺(aq) + 6 e^- → 2 Cr³⁺(aq) + 7 H₂O(l) E° = + 1.33 V
CrO₄^2-(aq) + 4 H₂O(l) + 6 e^- → Cr(OH) ₃(s) + 5 OH^-(aq) E° = - 0.13 V

• A)Cr₂O₇^2-
• B)Cr³⁺
• C)CrO₄^2-
• D)Cr(OH)₃

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