Which one of the following salts does <strong>NOT</strong> possess water of crystallization?

  1. A. Potassium permanganate
  2. B. Blue vitriol
  3. C. Washing soda
  4. D. Mohr's salt

Correct Answer: A. Potassium permanganate

Explanation

Potassium permanganate (KMnO_4) is anhydrous and does not contain water of crystallization. Blue vitriol, washing soda, and Mohr's salt all contain molecules of water of crystallization.

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