Q. Deuterium is an isotope of which element?
Answer: Hydrogen
Notes: Protium, deuterium and tritium are the three stable isotopes of hydrogen. Heavy water used in the nuclear reactors as moderator uses deuterium isotope of hydrogen.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 52 in Chemistry-3-Elements in above course in App.