Which of the following salts does NOT contain water of crystallization?

Correct option is A

The correct answer is (a) Baking soda.
· Baking soda (sodium bicarbonate, NaHCO₃) does not contain water of crystallization.
· It is an anhydrous compound, meaning it does not have water molecules in its crystalline structure.
Information Booster:
· Washing soda: Contains water of crystallization (Na₂CO₃·10H₂O).
· Blue vitriol: Also known as copper(II) sulfate pentahydrate (CuSO₄·5H₂O), which contains water of crystallization.
· Gypsum: Contains water of crystallization as calcium sulfate dihydrate (CaSO₄·2H₂O).