Answer :

Baking soda does not contain water of crystallization. The chemical formula of baking soda is NaHCO3. Its formula does not show any association with water molecules.


Other three contain water of crystallization blue vitriol (CuSO4 .5H2O), washing soda (Na2CO3 .10H2O) and gypsum (CaSO4 .2H2O).


Note:


The number of water molecules that are attached to a molecule of salt is called its water of crystallization. It is also known as water of hydration. This is necessary to maintain the crystalline structure of a salt. The salts that contain water of crystallization are called hydrated salts.

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