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 mid-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

The IChO 2026 Preparatory Problems, along with their solutions, have been released via Olympify to mentors for reading and translation.

If any country mentors are not able to access the problems via Olympify, please contact us at: icho2026@olympcenter.uz

Theoretical Problems

  • Organic Reaction Mechanisms
  • Physical Chemistry Calculations
  • Inorganic Structure Analysis
  • Thermodynamics & Equilibria
  • Real-world chemical applications

Practical Tasks

  • Titration & quantitative analysis
  • Synthesis of unknown compounds
  • Instrumental techniques (e.g. pH, spectrometry)
  • Observation & inference

Download Past IChO Problems (2019–2024)

IChO 2024 ProblemsIChO 2023 ProblemsIChO 2022 ProblemsIChO 2021 ProblemsIChO 2020 ProblemsIChO 2019 Problems