题目内容

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

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

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

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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

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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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The right battery symbol of the reaction of Cu(s) + 2H+ (0.01 mol/L) = Cu2+ (0.1 mol/L ) + H2 (0.9×1.013×105 Pa) is

A. (–) Cu(s) | Cu2+ (0.1 mol/L) || H+ (0.01mol/L) |H2 (0.9×1.013×105 Pa) | Pt(s) (+).
B. (–) Pt(s) | H+ (0.01mol/L) | H2 (0.9×1.013×105 Pa) || Cu2+ (0.1 mol/L) | Cu(s) (+).
C. (–) Cu(s) | Cu2+ (0.1 mol/L) | H+ (0.01mol/L) || H2 (0.9×1.013×105 Pa) | Pt(s) (+).
D. (–) Pt(s) | H2 (0.9×1.013×105 Pa) || H+ (0.01mol/L) |Cu2+ (0.1 mol/L) | Cu(s) (+).

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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 ?

Which of the following is not an ion electrode?

The right battery symbol of the reaction of Cu(s) + 2H+ (0.01 mol/L) = Cu2+ (0.1 mol/L ) + H2 (0.9×1.013×105 Pa) is

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