题目内容

Which of the following statements about redox titration is correct?

All redox reactions can be used for titration.
B. The size of the redox titration potential jump has nothing to do with the oxidation ability of the oxidant.
C. Some redox titrations do not need to add indicator.
D. Iodometry is an analytical method that only uses the oxidizing properties of I2 to perform titration.

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Under which of the following conditions, the redox reaction can proceed spontaneously?

A. EMF > 0
B. EMF < 0
C. K > 0
D. K< 0

The essence of redox reaction is the gain and loss of oxygen atoms.

The electromotive force of the primary cell of Pt│U4+(0.200 mol/L), UO22+(0.0150 mol/L), H+(0.0300 mol/L)║Fe2+(0.0100 mol/L), Fe3+(0.025 mol/L) │Pt (Fe3+ + e == Fe2+ E = 0.769 V; UO22+ + 4H+ + 2e == U4+ + 2H2O E = 0.334 V ) is ?

A. 0.671 V
B. 0.435 V
C. 0.617 V
D. 0.529 V

Which of the following is not an ion electrode?

A. Cu2+/Cu
B. Sn4+/Sn2+
Cr2O72–/Cr3+
D. Fe(CN)6]3–/[Fe(CN)6]4–

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