7 papers, 2019–2023 · Paper 1, Paper 2
Every Chemistry IGCSE past paper in the collection that assesses group 7 (halogens) – chlorine, bromine and iodine.
By unit: all units (7) · Paper 1 (5) · Paper 2 (2)
These papers were matched to group 7 (halogens) – chlorine, bromine and iodine automatically, by keyword patterns in their questions and mark schemes. A hand-check of 100 randomly chosen matches, each read against the source question paper and the specification's own statements for the topic, found 99 that genuinely assess the topic and 1 that does not — 99% (95% confidence interval 94.6–99.8%). That is a good way to find practice on a topic, not proof a paper covers it, and a paper missing from this list may still assess it. The topics are the specification’s headings, which are broad: one question on any statement under a heading was enough.