某一含有 Cl - 、 Br - 、 I - 三种离子的溶液,选择下列哪种氧化剂可以只把 I - 氧化出来而 Cl - 、 Br - 留在溶液中?(已知 ψ y (Cl 2 /Cl - )=1.36V , ψ y (Br 2 /Br - )=1.07V , ψ y (I 2 /I - )=0.54V )
A.
ψ Ө ( Cr 2 O 7 - /Cr 3+ ) = 1.33V
B.
ψ Ө ( MnO 4 - /Mn 2+ ) = 1.49V
C.
ψ Ө ( Fe 3+ /Fe 2+ ) = 0.77V
D.
ψ Ө ( Cu 2+ /Cu + ) = 0.3402V
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