What is the chemical name of plaster of Paris?
Answer and explanation
Correct answer: Calcium sulphate hemihydrate
The governing concept is the formation and identification of salts containing water of crystallisation. Plaster of Paris is calcium sulphate hemihydrate, CaSO₄·½H₂O. It is produced by carefully heating gypsum, CaSO₄·2H₂O, so that part of its water of crystallisation is removed. Therefore option A is correct. Sodium chloride is common salt, sodium carbonate decahydrate is washing soda, and calcium carbonate is a different calcium compound.
Frequently asked questions
What is the correct answer to this question?
Calcium sulphate hemihydrate
Why is this the correct answer?
The governing concept is the formation and identification of salts containing water of crystallisation. Plaster of Paris is calcium sulphate hemihydrate, CaSO₄·½H₂O. It is produced by carefully heating gypsum, CaSO₄·2H₂O, so that part of its water of crystallisation is removed. Therefore option A is correct. Sodium chloride is common salt, sodium carbonate decahydrate is washing soda, and calcium carbonate is a different calcium compound.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
