Predicting feasibility and limitations Quiz
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5 questions, one answer each
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1. What is E°cell for Cl₂ + 2Br⁻ → 2Cl⁻ + Br₂? E°(Cl₂/Cl⁻) = +1.36 V; E°(Br₂/Br⁻) = +1.07 V.
- A. −0.29 V
- B. +0.29 V
- C. +2.43 V
- D. +0.58 V
2. A reaction has E°cell = +0.40 V but no change is seen at room temperature. What is the best explanation?
- A. ΔS(total) is negative
- B. K is less than 1
- C. The concentrations are all 1.00 mol dm⁻³
- D. The reaction has a very high activation energy
3. Using E° values, which is the strongest reducing agent: Li(s) (Li⁺/Li, −3.04 V), Ag(s) (Ag⁺/Ag, +0.80 V), Li⁺(aq) or Ag⁺(aq)?
- A. Li(s)
- B. Li⁺(aq)
- C. Ag(s)
- D. Ag⁺(aq)
4. Reaction A has E°cell = +0.30 V and reaction B has E°cell = +0.60 V, both with n = 2 at the same T. How does ln K for B compare with A?
- A. Half as large
- B. The same
- C. Twice as large
- D. Four times as large
5. What defines a disproportionation reaction?
- A. A species is reduced by a different species
- B. The same species is both oxidised and reduced
- C. A species loses all its electrons
- D. Two species swap oxidation numbers