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Icho50

Previous preparatory problems

47th International Chemistry Olympiad
Baku, Azerbaijan
July 20-29, 2015
Preparatory problems icho 2015 (PDF)

45th International Chemistry Olympiad
Moscow, Russia
July 15–24, 2013
Preparatory problems icho 2013 (PDF)

44th International Chemistry Olympiad
Washington, D.C., United States
July 21–30, 2012
Preparatory problems icho 2012 (PDF)

43th International Chemistry Olympiad
Ankara, Turkey
July 9–18, 2011
Preparatory problems icho 2011 (PDF)