A-LevelChemistryGroup 179701/12 · Oct/Nov 2016 · Q161 Mark

J is a salt of one of the halogens chlorine, bromine, iodine or astatine. The reaction scheme shows a series of reactions using a solution of J as the starting reagent. [Figure showing reaction scheme: J(aq) -> HNO3(aq) + AgNO3(aq) -> a precipitate; this precipitate then reacts with an excess of dilute NH3(aq) -> a colourless solution; this colourless solution then reacts with an excess of HNO3(aq) -> a precipitate] What could J be?

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Asodium chloride

Bsodium bromide

Cpotassium iodide

Dsodium astatide

✓ Correct answer

A: sodium chloride

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 2, question 16.

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