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In which conversion is the metal reduced? A Cr₂O₇²⁻ → CrO₄²⁻ B MnO₄²⁻ → MnO₄⁻ C TiO₂ → TiO₄²⁻ D VO₃⁻ → VO⁺ - AQA - A-Level Chemistry - Question 11 - 2020 - Paper 3

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Question 11

In-which-conversion-is-the-metal-reduced?--A-Cr₂O₇²⁻-→-CrO₄²⁻-B-MnO₄²⁻-→-MnO₄⁻-C-TiO₂-→-TiO₄²⁻-D-VO₃⁻-→-VO⁺-AQA-A-Level Chemistry-Question 11-2020-Paper 3.png

In which conversion is the metal reduced? A Cr₂O₇²⁻ → CrO₄²⁻ B MnO₄²⁻ → MnO₄⁻ C TiO₂ → TiO₄²⁻ D VO₃⁻ → VO⁺

Worked Solution & Example Answer:In which conversion is the metal reduced? A Cr₂O₇²⁻ → CrO₄²⁻ B MnO₄²⁻ → MnO₄⁻ C TiO₂ → TiO₄²⁻ D VO₃⁻ → VO⁺ - AQA - A-Level Chemistry - Question 11 - 2020 - Paper 3

Step 1

D VO₃⁻ → VO⁺

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Answer

In the conversion D, VO₃⁻ to VO⁺, the vanadium (V) in vanadate is reduced. The reduction occurs as the oxidation state of vanadium changes from +5 in VO₃⁻ to +4 in VO⁺. This indicates that the metal has gained electrons, therefore confirming that this is the correct conversion where the metal is reduced.

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