The International Chemistry Olympiad (IChO) is an annual academic competition for high school students.
If you like to learn about the problems and solutions of 45th International Chemistry Olympiad (IChO) – 2013, Here are the link for you to download it.
1. Theoretical Problem
2. Practical Problem
3. Theoretical Solution
Sumber/Source: http://icho2013.chem.msu.ru