Standard electrode potentials Quiz
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5 questions, one answer each
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1. What is the oxidation number of nitrogen in NO₃⁻?
- A. +3
- B. +4
- C. +5
- D. +6
2. Which of these is a standard condition for measuring E°?
- A. Ion concentrations of 1.00 mol dm⁻³
- B. Ion concentrations of 0.10 mol dm⁻³
- C. A temperature of 273 K
- D. A gas pressure of 1000 kPa
3. Which electrode would be used to measure E° for the Fe³⁺/Fe²⁺ half-cell?
- A. Iron
- B. Copper
- C. Zinc
- D. Platinum
4. Why is the SHE defined as 0.00 V?
- A. Hydrogen is the most reactive element
- B. It is the zero point of the scale, because the potential of a single half-cell cannot be measured
- C. Platinum has zero potential
- D. Hydrogen has no electrons to lose
5. In the reaction Mg + 2H⁺ → Mg²⁺ + H₂, which statement is correct?
- A. Mg is oxidised from 0 to +2 and H is reduced from +1 to 0
- B. Mg is reduced and H⁺ is oxidised
- C. Mg is oxidised from +2 to 0
- D. H is oxidised from +1 to 0