Nelson cell is used for the preparation of

Options :
  1. slaked lime
  2. baryta
  3. Sodium
  4. Caustic soda
Answer and Explanation :-

Answer: Option 4

Explanation:

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I suffer from life and from other people. I can't look at reality face to face. Even the sun discourages and depresses me. Only at night and all alone, withdrawn, forgotten and lost, with no connection to anything real or useful - only then do I find myself and feel comforted.
-Fernando Pessoa The Book of Disquiet