Q. What is philosopher's wool?
Answer: Zinc oxide
Notes: Zinc oxide is called as the philosopher's wool. Chemical formula of zinc oxide is ZnO and it is insoluble in water. On burning in air, zinc oxide turns into white woolly tuft.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 31 in General Studies Mock Test - 52 in above course in App.