Which one of the following salts does not con-tain water of crystallisation?

Which one of the following salts does not con-tain water of crystallisation?

Q. Which one of the following salts does not con-tain water of crystallisation?

  1. Blue vitriol
  2. Baking soda
  3. Washing soda
  4. Gypsum

Answer: Baking soda

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