Which of the following salts does not contain water of crystallization ? -SST 10th

Which of the following salts does not contain water of crystallization ? -SST 10th
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Answer :

B - 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 .5H20), washing soda (Na2CO3 .1OH2O) and gypsum (CaSO4 2H20).
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