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In which conversion is the metal reduced? A Cr2O7^2- → CrO4^2- B MnO4^2- → MnO4^- C TiO2 → TiO3^2- D VO3^- → VO^+ - AQA - A-Level Chemistry - Question 11 - 2020 - Paper 3
Question 11
In which conversion is the metal reduced? A Cr2O7^2- → CrO4^2- B MnO4^2- → MnO4^- C TiO2 → TiO3^2- D VO3^- → VO^+
Worked Solution & Example Answer:In which conversion is the metal reduced? A Cr2O7^2- → CrO4^2- B MnO4^2- → MnO4^- C TiO2 → TiO3^2- D VO3^- → VO^+ - AQA - A-Level Chemistry - Question 11 - 2020 - Paper 3
Step 1
D VO3^- → VO^+
Answer
In the conversion of VO3^- to VO^+, the oxidation state of vanadium is reduced. This is because VO3^- has vanadium in a higher oxidation state compared to VO^+. The reduction can be summarized as follows:
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Identify the oxidation states:
- In VO3^-, vanadium is typically in the +5 oxidation state.
- In VO^+, vanadium is in the +4 oxidation state.
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Analyze the change in oxidation state:
- The transition from +5 to +4 signifies a reduction process, as reduction is defined as a gain of electrons or a decrease in oxidation state.
Therefore, among the provided options, the correct answer is D, as it shows the reduction of the metal.