题目内容

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

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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

Which of the following substances can reduce the electrode potential of Fe2+/ Fe?

A. NaOH
B. HCl
C. FeCl3
D. None of them

Which of the following substances cannot be used as a reference substance?

A. Na2B4O7·10H2O
B. Na2CO3
C. KOH
D. H2C2O4·2H2O

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