Which is called philosopher's wool

Options :
  1. zinc bromide
  2. zinc nitrate
  3. zinc oxide
  4. zinc chloride
Answer and Explanation :-

Answer: Option 3

Explanation:

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Don't you notice that there are particular moments when you are naturally inspired to introspection? Work with them gently, for these are the moments when you can go through a powerful experience, and your whole worldview can change quickly.
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