Q. Which of the following is an allotrope of oxygen?
Answer: Ozone
Notes: Ozone is an allotrope of oxygen (symbol O3) having three atoms in the molecule instead of the usual two. It is a very reactive allotrope of oxygen that is destructive to materials like rubber and fabrics and is also damaging to lung tissue.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 42 in Chemistry-3-Elements in above course in App.