The water of crystallization is present in:
Step 1: Water of Crystallization Explained. Water of crystallization refers to water molecules within the crystal structure of specific salts.
Step 2: Compound Analysis. - Bleaching Powder: Includes water of crystallization.
- Washing Soda: Includes water of crystallization.
- Plaster of Paris: Includes water of crystallization.
- Baking Soda: Does not contain water of crystallization.
Step 3: Answer. The correct answer is option (C), comprising Bleaching Powder and Washing Soda.

