What this tests
Syllabus point 12.4 — Separation and purification, in Experimental techniques and chemical analysis. Difficulty easy (estimated from the question's demands, not a Cambridge rating).
Cambridge IGCSE Chemistry 0620 · 12.4 Separation and purification
June 2014 · Paper 12 · Question 3
One real Cambridge question from Experimental techniques and chemical analysis, with the official answer.