A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2024 · Q121 Mark

The equation for the reaction of aqueous thiosulfate ions, S2O3²⁻, and aqueous dioxo-vanadium ions, VO2⁺, is shown. 2S2O3²⁻ + XVO2⁺ + yH⁺ → S4O6²⁻ + zVO²⁺ + 2H2O Which row shows two correct statements about the equation for this reaction?

Ax and z are the same value and quarter the value of y from +4 to +5

Bx and z are the same value and quarter the value of y from +5 to +4

Cx and z are the same value and half the value of y from +5 to +4

Dx and z are the same value and half the value of y from +4 to +5

✓ Correct answer

C: x and z are the same value and half the value of y from +5 to +4

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2024 Paper 1 Variant 2, question 12.

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