Which of the following salts does not contain any water of crystallisation?Only one correct answerA.Baking sodaB.Washing sodaC.GypsumD.Plaster of paris

To determine which of the given salts does not contain any water of crystallization, we can review the nature of each option:

1. Baking Soda (Sodium Bicarbonate, NaHCO₃): This compound is often found in its anhydrous form and does not typically contain water of crystallization.

2. Washing Soda (Sodium Carbonate Decahydrate, Na₂CO₃·10H₂O): This salt contains ten molecules of water associated with each formula unit.

3. Gypsum (Calcium Sulfate Dihydrate, CaSO₄·2H₂O): Gypsum contains two molecules of water in every molecule of calcium sulfate.

4. Plaster of Paris (Calcium Sulfate Hemihydrate, CaSO₄·½H₂O): Plaster of Paris contains half a molecule of water for each formula unit.

Conclusion

• Baking soda is the only compound among the options given that does not contain any water of crystallization.

Final Answer

A. Baking soda does not contain any water of crystallization.