Which one of the following statements is NOT correct ?
- A. Water of crystallization is the fixed number of water molecules present in one formula unit of a salt
- B. The molecular formula of Plaster of Paris is \\( CaSO_{4} \\cdot 2H_{2}O \\) ✓
- C. Washing soda is used for removing the permanent hardness of water
- D. The atmosphere of Venus is made up of thick white and yellow clouds of sulphuric acid
Correct Answer: B. The molecular formula of Plaster of Paris is \\( CaSO_{4} \\cdot 2H_{2}O \\)
Explanation
The formula for Plaster of Paris is calcium sulphate hemihydrate, \\( CaSO_{4} \\cdot \\frac{1}{2}H_{2}O \\), not \\( CaSO_{4} \\cdot 2H_{2}O \\) (which is gypsum).
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