Question

The water of crystallization is present in:

1. Bleaching Powder
2. Plaster of Paris
3. Washing Soda
4. Baking Soda

Options

• (ii) and (iv)

• (ii) and (iii)

• (i) and (iii)

• (i) and (iv)

Answer 1

(ii) and (iii)

Explanation:

• Plaster of Paris (POP) \[\ce{(CaSO4*1/2 H2O)}\] contains water of crystallization, which helps it set into a hard mass when mixed with water.
• Washing Soda (Na₂CO₃·10 H₂O) has 10 molecules of water of crystallization, making it a hydrated salt.
• Bleaching Powder (Ca(OCl)₂) and Baking Soda (NaHCO₃) do not contain water for crystallization.
• Baking soda (NaHCO₃) does not contain water of crystallisation.