Quiz on Oxidation and Reduction

The relationship between the oxidation and reduction forms of metal M is represented in the form of the reduction process.

• M → Mn+ + ne.

• Mn+ + ne → M.

• Mn+ → M + ne.

• M + ne → Mn+

The symbol of the oxidation-reduction pair corresponding to the reduction process: Al3+ + 3e → Al is

• Al/Al3+.

• Fe2+/Fe.

• Al3+/Al.

• Fe3+/Fe.

The symbol of the oxidation-reduction pair corresponding to the reduction process: Fe3+ + 1e → Fe2+ is

• Fe3+/Fe2+.

• Fe2+/Fe.

• Fe3+/Fe.

• Fe2+/Fe3+.

The half-reaction corresponding to the oxidation-reduction pair K+/K is

• Na+ + 1e → Na.

• K+ + 1e → K.

• K+ → K + 1e.

• Zn2+ + 2e → Zn.

Which oxidation-reduction pair has a standard electrode potential value defined as 0?

• Na+/Na.

• 2H+/H2.

• Al3+/Al.

• Cl2/2Cl-

Which of the following oxidation-reduction pairs has a standard electrode potential value greater than 0?

• K+/K.

• Li+/Li.

• Ba2+/Ba.

• Cu2+/Cu.

Given the oxidation-reduction pairs of metals and their corresponding standard electrode potentials: Li+/Li, Mg2+/Mg, Zn2+/Zn, Ag+/Ag with potentials V, -3.040, -2.356, -0.762, +0.799. Which metal has the strongest reducing ability?

• Mg.

• Zn.

• Ag.

• Li.

Given the oxidation-reduction pairs of halogens and their corresponding standard electrode potentials: F2/2F-, Cl2/2Cl-, Br2/2Br-, I2/2I- with standard potentials (V) +2.87, +1.358, +1.087, +0.621. Arrange the halide ions in order of decreasing reducing ability.

• F-, Cl-, Br-, I-.

• Cl-, F-, Br-, I-.

• I-, Br-, Cl-, F-.

• Br-, I-, F-, Cl-.

The standard electrode potentials of the oxidation-reduction pairs of metals M+/M and R2+/R are +0.799 V and +0.34 V respectively. Which of the following statements is correct under standard conditions?

• M has a stronger reducing ability than R.

• M has a weaker oxidizing ability than R2+.

• M can reduce H+ ions to H2.

• R can reduce M+ ions to M.