A-LevelChemistryGroup 179701/12 · May/June 2017 · 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

✓ Correct answer

D: mixture of sodium chloride and sodium iodide

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 17.

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