Q. Who discovered that water is composed of two parts hydrogen and one part oxygen by volume?
Answer: Joseph Louis Gay-Lussac
Notes: Joseph Louis Gay-Lussac (1778 – 1850) was a French chemist who with Alexander von Humboldt discovered that water is made of two parts hydrogen and one part oxygen. He is also known to have worked on alcohol-water mixtures, due to which Gay-Lussac unit / degree is used to measure alcoholic beverages in many countries. He is also known to have discovered Iodine.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 19 in Chemistry-1: Important Chemical Scientists in above course in App.