A-LevelChemistryGroup 179701/12 · May/June 2010 · Q151 Mark

X is a salt of one of the halogens chlorine, bromine, iodine, or astatine (proton number 85). The reaction scheme shows a series of reactions using a solution of X as the starting reagent. [Figure 15 - Reaction Scheme] What could X be?

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Asodium chloride

Bsodium bromide

Cpotassium iodide

Dpotassium 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, May/June 2010 Paper 1 Variant 2, question 15.

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