A-LevelChemistryChemical periodicity9701/12 · May/June 2022 · Q171 Mark

NH₃(aq) is added to separate samples of NaCl(aq), MgCl₂(aq), BaCl₂(aq) and SiCl₄(l). Under the conditions of this experiment, only two samples will produce a white precipitate when NH₃(aq) is added. What are these two samples?

AMgCl₂(aq) and BaCl₂(aq)

BMgCl₂(aq) and SiCl₄(l)

CNaCl(aq) and BaCl₂(aq)

DNaCl(aq) and SiCl₄(l)

✓ Correct answer

B: MgCl₂(aq) and SiCl₄(l)

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2022 Paper 1 Variant 2, question 17.

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