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【单选题】
已知 25°C 时电极反应 + 8H + + 5e==MnO 2 + 4H 2 O 的 j θ =1.51V 。若此时 c(H + ) 由 1mol· 减小到 10 -4 mol· ,则该电对的电极电势变化值为 ( )A.
上升 0.38V
B.
上升 0.047V
C.
下降 0.38V
D.
下降 0.047V
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A.
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B.
A decorator.
C.
A plumber.
D.
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A.
in order
B.
in disarray
C.
out of place
D.
in mess
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A.
drawn
B.
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C.
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D.
crammed
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A.
正确
B.
错误
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A.
there, here
B.
go there, go here
C.
to there, to here
D.
go to there, go to here
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A.
drew
B.
dressed
C.
adorned
D.
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