Which pair will react to form calcium sulphate and water?
Answer and explanation
Correct answer: Calcium oxide and sulphuric acid
The governing concept is neutralisation of a basic metal oxide by an acid. Calcium oxide reacts with sulphuric acid according to CaO + H2SO4 → CaSO4 + H2O, producing exactly calcium sulphate and water. Therefore option A is correct. A carbonate would also release carbon dioxide in an acid reaction, while the other listed pairs do not provide the stated products under the given conditions.
Frequently asked questions
What is the correct answer to this question?
Calcium oxide and sulphuric acid
Why is this the correct answer?
The governing concept is neutralisation of a basic metal oxide by an acid. Calcium oxide reacts with sulphuric acid according to CaO + H2SO4 → CaSO4 + H2O, producing exactly calcium sulphate and water. Therefore option A is correct. A carbonate would also release carbon dioxide in an acid reaction, while the other listed pairs do not provide the stated products under the given conditions.
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.
