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UPSC 2007: Which one of the following is called Philosopher’s wool?
(a)Zinc Bromide
(b)Zinc Nitrate
(c)Zinc Oxide
(d)Zinc Chloride
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Not attemptedCorrect Answer: (c) Zinc Oxide
“Philosopher’s wool” is the fluffy white sublimation product obtained when metallic zinc is oxidised in air; chemically it is zinc oxide (ZnO). Other listed zinc salts do not bear this historical name. ([gkseries.com](https://www.gkseries.com/upsc-previous-years-solved-questions-and-answers/chemistry/discussion-34?utm_source=openai))
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What is the correct answer to this UPSC 2007 Science & Technology question?▼
The correct answer is option (c): Zinc Oxide. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Chemistry question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2007, GS Paper 1, as Question 121. It falls under Science & Technology > Chemistry.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Chemistry?▼
UPSC has asked 53 questions from Chemistry (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.