Question:
Which one of the following statements is NOT correct?
Which one of the following statements is NOT correct?
Options:
- Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt
- The molecular formula of Plaster of Paris is CaSO4 • 2H2O
- Washing soda is used for removing the permanent hardness of water
- The atmosphere of Venus is made up of thick white and yellow clouds of sulphuric acid
- Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt
- The molecular formula of Plaster of Paris is CaSO4 • 2H2O
- Washing soda is used for removing the permanent hardness of water
- The atmosphere of Venus is made up of thick white and yellow clouds of sulphuric acid
Correct Answer: The molecular formula of Plaster of Paris is CaSO4 • 2H2O
Explanation:
The molecular formula of plaster of paris is CaSO4 ⋅ 1/2H2O. CaSO4 ⋅ 2H2O is the molecular formula of gypsum.
The molecular formula of plaster of paris is CaSO4 ⋅ 1/2H2O. CaSO4 ⋅ 2H2O is the molecular formula of gypsum.