Standard electrode potentials and the hydrogen electrode Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What is the oxidation number of chromium in Cr₂O₇²⁻?
- A. +3
- B. +7
- C. +6
- D. +12
2. Which concentration of H⁺ ions is used in the standard hydrogen electrode?
- A. 1.00 mol dm⁻³
- B. 0.10 mol dm⁻³
- C. 2.00 mol dm⁻³
- D. 0.01 mol dm⁻³
3. Why is platinum used for the Fe³⁺|Fe²⁺ half-cell?
- A. Platinum is oxidised by Fe³⁺ to make the cell work
- B. Both ions are in solution, so an inert electrode is needed to conduct electrons
- C. Platinum is the strongest reducing agent available
- D. Platinum raises the E° of the half-cell
4. A half-cell has E° = −0.76 V against the SHE. What does this show?
- A. The oxidised form is a stronger oxidising agent than H⁺
- B. The half-cell is at the wrong temperature
- C. The cell is a better reference than the SHE
- D. The reduced form is a stronger reducing agent than H₂
5. Why must the voltmeter used to measure E° have a high resistance?
- A. To increase the voltage of the cell
- B. To make the salt bridge conduct
- C. So almost no current flows and the concentrations stay standard
- D. To keep hydrogen at 100 kPa