Previous Preparatory Problems

51^th International Chemistry Olympiads

Paris, France

From 21 to 30 July 2019

Preparatory Problem IChO 2019

50^th International Chemistry Olympiads

Bratislava, Slovakia and Prague, Czech Republic

From 19 to 29 July 2018

Theoretical Preparatory Problem IChO 2018

Practical Preparatory Problem IChO 2018

49^th International Chemistry Olympiads

Nakhon Pathom, Thailand

From 6 to 15 July 2017

Preparatory Problem IChO 2017

48^th International Chemistry Olympiads

Tbilisi, Georgia

From 23 July to 1st August 2016

Preparatory Problem IChO 2016