Olympiad Problems

Types of Problems

IChO problems challenge students' analytical thinking, creativity, and deep understanding of chemistry across various disciplines.

IChO 2026 Exam Problems

The IChO 2026 exam problems, solutions, and translations will be available for download on this page after the competition concludes in 10–19 July 2026.

  • Official English versions of the theoretical and practical problems and solutions (PDFs)
  • Translations of the theoretical and practical exams by participating delegations (zip files, organized alphabetically by country code ISO-3)

Preparatory Problems

Access the preparatory problems to help students prepare for IChO 2026.

Preparatory Problems

Solutions to Preparatory Problems

Access the Solutions to Preparatory Problems to help students prepare for IChO 2026.

Solutions to Preparatory Problems

Download Past IChO Problems (2020–2025)

IChO 2025 ProblemsIChO 2024 ProblemsIChO 2023 ProblemsIChO 2022 ProblemsIChO 2021 ProblemsIChO 2020 Problems