用 0.1mol·L - 1 Sn 2+ 和 0.01mol·L - 1 Sn 4+ 组成的电极,其电极电势是:
A.
E Ө + 0.0592/2 ;
B.
E Ө + 0.0592 ;
C.
E Ө - 0.0592 ;
D.
E Ө - 0.0592/2 ;
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