Question

In the two half-reactions shown below, which chromium species is the strongest oxidizing agent?
Cr2O72-(aq) + 14 H+(aq) + 6 e- -> 2 Cr3+(aq) + 7 H2O(l) E = + 1.33 V
CrO42-(aq) + 4 H2O(l) + 6 e- -> Cr(OH)3(s) + 5 OH-(aq) E = - 0.13 V
A) Cr2O72-
B) Cr3+
C) CrO42-
D) Cr(OH)3

Answer

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