A-LevelChemistryGroup 17May/June 2017Paper 1 Q171 Mark
A powder is known to be either a single sodium halide or a mixture of two sodium halides. A sample of the powder was dissolved in water. Aqueous silver nitrate was added, and a pale yellow precipitate was formed. When concentrated aqueous ammonia was then added, this precipitate partly dissolved leaving a darker yellow precipitate. What might the powder be?
Asodium bromide only
Bsodium iodide only
Cmixture of sodium chloride and sodium bromide
Dmixture of sodium chloride and sodium iodide
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The correct answer is D. This question tests the candidate's understanding of group 17 within the Chemistrysyllabus. The examiner's mark scheme requires...
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