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Previous preparatory problems

49th International Chemistry Olympiad
Nakhon Pathom, Thailand
6-15 July, 2017

IChO-2017 Preparatory Problems PDF
Corrections for IChO-2017 Preparatory Problems (2 Apr 2017) PDF
Solutions to IChO-2017 Preparatory Problems PDF
Calculator used for for the exams: Casio fx-991EX Classwiz (User’s Guide, PDF)

48th International Chemistry Olympiad
Tbilisi, Georgia
July 23-August 1, 2016

Preparatory problems: PDF
Preparatory problems with solutions: PDF

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

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

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

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