What this tests
Syllabus point 6.2 — Rate of reaction, in Chemical reactions. Difficulty medium (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 · 6.2 Rate of reaction
November 2017 · Paper 23 · Question 13
One real Cambridge question from Chemical reactions, with the official answer. Cambridge has printed this question 3 times.