Question

The water of crystallization is present in:
(i) Bleaching Powder
(ii) Plaster of Paris
(iii) Washing Soda
(iv) Baking Soda

• A. (ii) and (iv)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (i) and (iv)

Hint:

The water of crystallization is the water present in the crystal structure of certain salts, like plaster of Paris and washing soda.

Answer 1

The Correct Option is B

Water of crystallization refers to the water molecules that are chemically bound within the crystal structure of certain salts. This water is essential to maintaining the structure of these salts.
- Plaster of Paris (Calcium sulphate hemihydrate, \( \text{CaSO}_4 \cdot ½\text{H}_2\text{O} \)) contains water of crystallization.
- Washing Soda (Sodium carbonate decahydrate, \( \text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O} \)) also contains water of crystallization.
- Bleaching Powder and Baking Soda do not contain water of crystallization. Thus, the correct answer is (B) (ii) and (iii).