What is the chemical name of plaster of Paris?
Answer and explanation
Correct answer: Calcium sulphate hemihydrate
Plaster of Paris is calcium sulphate hemihydrate, represented by CaSO₄·½H₂O, so option A is correct. It is prepared by carefully heating gypsum, CaSO₄·2H₂O, to remove part of its water of crystallisation. When water is added, it changes back to gypsum and sets into a hard mass. Sodium chloride, washing soda and calcium carbonate are different salts with different formulas and uses.
Frequently asked questions
What is the correct answer to this question?
Calcium sulphate hemihydrate
Why is this the correct answer?
Plaster of Paris is calcium sulphate hemihydrate, represented by CaSO₄·½H₂O, so option A is correct. It is prepared by carefully heating gypsum, CaSO₄·2H₂O, to remove part of its water of crystallisation. When water is added, it changes back to gypsum and sets into a hard mass. Sodium chloride, washing soda and calcium carbonate are different salts with different formulas and uses.
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.
