Given the following standard reduction potentials in acid solution:
Cr3+ + 3 e� ? Cr
E� = �0.74 V
Co2+ + 2 e� ? Co
E� = �0.28 V
MnO4� + 8 H+ + 5 e� ? Mn2+ + 4 H2O
E� = 1.51 V
The strongest reducing agent listed above is
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