The 2024 G.C.E. (A/L) Chemistry Paper I set by the Department of Examinations, Sri Lanka: 50 multiple-choice questions in two hours, no calculators. R = 8.314 J K⁻¹ mol⁻¹, Avogadro constant = 6.022 × 10²³ mol⁻¹, Planck constant h = 6.626 × 10⁻³⁴ J s, speed of light c = 3 × 10⁸ m s⁻¹. In questions 31–40 one or more of the responses (a), (b), (c) and (d) is correct: choose (1) if only (a) and (b) are correct, (2) if only (b) and (c), (3) if only (c) and (d), (4) if only (d) and (a), and (5) for any other number or combination of correct responses. Questions 41–50 give two statements; choose the response that best fits them. Answers are from the official marking scheme, which gives the mark for Q29 to every answer and accepts either (4) or (5) for Q31. Figures are shown exactly as printed. Each question links to the lesson it tests.