A-Level AQA Chemistry Electrode Potentials & Electrochemical Cells: This question is about vanadium

Question

This question is about vanadium compounds and ions.
Use data from Table 4 to identify the species that can be used to reduce VO₄⁻ ions to VO³⁻ in aqueous solution and no further.
Explain your answer.

Table 4

Electrode half-equation           E° / V

VO₄²⁻(aq) + 2H⁺(aq) + e⁻ ↔ VO₃⁻(aq) + H₂O(l)         +1.00

VO₃⁻(aq) + 2H⁺(aq) + 2e⁻ ↔ VO₂⁻(aq) + H₂O(l)         +0.34

Cl₂(g) + 2e⁻ ↔ 2Cl⁻(aq)                        +1.36

Fe³⁺(aq) + e⁻ ↔ Fe²⁺(aq)                     +0.77

Zn²⁺(aq) + 2e⁻ ↔ Zn(s)                            -0.76

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This question is about vanadium compounds and ions - AQA - A-Level Chemistry - Question 9 - 2018 - Paper 1

Worked Solution & Example Answer:This question is about vanadium compounds and ions - AQA - A-Level Chemistry - Question 9 - 2018 - Paper 1

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