A-LevelChemistryGroup 17Feb/Mar 2025Paper 1 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⁻
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The correct answer is B. This question tests the candidate's understanding of group 17 within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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