题目内容

Which of the following item has the largest specific surface area assuming that they have the same density?

A sphere with the diameter of 5 μm
B. A rectangular block with the length of 10 μm, width of 8 μm and thickness of 5 μm
C. A cube with the length of the side of 8 μm
D. A sphere with the diameter of 8 μm

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Which of the following is acid cation?

A. Ca2+
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D. K+

Ions with the same valence share the same exchange ability.

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