Which one of the following is called Philosopher's wool?
Reviewed by Dalvoy
UPSC Civil Services preparation
- AZinc bromide
- BZinc nitrate
- CZinc oxideCorrect
- DZinc chloride
Explanation
The correct answer is C) Zinc oxide.
Explanation:
C) Zinc oxide: This is the correct answer. Zinc oxide (ZnO) was historically known as "Philosopher's wool" or "lana philosophica" by alchemists and early chemists. This name came from its appearance: when zinc metal was burned in air, it produced a white, fluffy, wool-like solid, which was zinc oxide.
A) Zinc bromide: This is a different chemical compound (ZnBr2) and is not known as Philosopher's wool.
B) Zinc nitrate: This is another distinct chemical compound (Zn(NO3)2) and does not carry the name Philosopher's wool.
D) Zinc chloride: This is a different chemical compound (ZnCl2) and is not referred to as Philosopher's wool.
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