已知在 1 mol·L -1 H 2 SO 4 溶液中 φ ⊙‘ ( MnO 4 - /Mn 2+ ) =1.45V , φ ⊙‘ ( Fe 3+ /Fe 2+ ) =0.68V ,在此条件下用 KMnO 4 标准溶液滴定 Fe 2+ ,其计量点的电势值为( )。
A.
0.38V
B.
0.89V
C.
1.32V
D.
1.49V
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参考答案:
举一反三
【单选题】(Read the following paragraph carefully and identify the topic sentence.) Albert Einstein, one of the world’s geniuses, failed his university entrance examinations on his first attempt. William Faulkn...
A.
The topic sentence is the first sentence.
B.
The topic sentence is the last sentence.
C.
The topic sentence is in the middle of the paragraph.
D.
The topic sentence is not presented but implied in the paragraph.
【简答题】Albert Einstein, one of the world’s geniuses, failed his university entrance examinations on his first attempt. William Faulkner, one of American’s noted writers, never finished college because he cou...