题目内容

Non-fluorescent substances cannot be detected directly by fluorescence analysis.

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According to Lambert-Beer law, the greater the concentration of the measured solution, the greater the absorbance and the higher the accuracy of the measurement results.

The copper sulfate solution appears blue, because which color of white light is absorbed by this solution?

A. Blue
B. Yellow
C. Violet
D. Green

After keeping 3 significant figures, which of the following results is incorrect?

A. 3.175 should be 3.18.
B. 3.165 should be 3.16.
C. 3.1749 should be 3.17.
D. 3.1749 should be 3.18.

E(Cl2/Cl–) = 1.36 V, E(I2/I–) = 0.535 V, E(Fe3+/Fe2+) = 0.769 V. In the standard state, the correct order of oxidation capacity is

A. Cl2 > I2 > Fe3+
B. Cl2 > Fe3+ > I2
C. Cl2 > Fe2+ > I2
D. I2 > Fe3+ > Cl2