Which pair is correctly matched?
Answer and explanation
Correct answer: Plaster of Paris — calcium sulphate hemihydrate
Plaster of Paris is calcium sulphate hemihydrate, written as CaSO₄·½H₂O, so option B is correctly matched. Bleaching powder is not sodium chloride; baking soda is sodium hydrogen carbonate, not calcium sulphate; and washing soda is sodium carbonate decahydrate, not calcium carbonate. These comparisons establish that only option B is correct.
Frequently asked questions
What is the correct answer to this question?
Plaster of Paris — calcium sulphate hemihydrate
Why is this the correct answer?
Plaster of Paris is calcium sulphate hemihydrate, written as CaSO₄·½H₂O, so option B is correctly matched. Bleaching powder is not sodium chloride; baking soda is sodium hydrogen carbonate, not calcium sulphate; and washing soda is sodium carbonate decahydrate, not calcium carbonate. These comparisons establish that only option B is correct.
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.
