A-LevelChemistryGroup 179701/12 · Feb/Mar 2025 · Q191 Mark
U, V and W represent different halogens. The table shows the results of nine experiments in which aqueous solutions of U2, V2 and W2 were separately added to separate aqueous solutions containing U⁻, V⁻ and W⁻ ions. U⁻(aq) V⁻(aq) W⁻(aq) U2(aq) no reaction no reaction no reaction V2(aq) U2 formed no reaction W2 formed W2(aq) U2 formed no reaction no reaction Which row contains the ions U⁻, V⁻ and W⁻ in order of their decreasing strength as reducing agents?
AU⁻ V⁻ W⁻
BU⁻ W⁻ V⁻
CV⁻ W⁻ U⁻
DW⁻ U⁻ V⁻
✓ Correct answer
B: U⁻ W⁻ V⁻
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