What this tests
Syllabus point 10.1 — Water, in Chemistry of the environment. Difficulty hard (estimated from the question's demands, not a Cambridge rating).
Also set in
The same question, as Cambridge printed it in other papers.
Cambridge IGCSE Chemistry 0620 · 10.1 Water
June 2025 · Paper 22 · Question 29
One real Cambridge question from Chemistry of the environment, with the official answer. Cambridge has printed this question 2 times.