Which white precipitate forms when barium chloride and sodium sulphate solutions are mixed?
Answer and explanation
Correct answer: Barium sulphate
Mixing BaCl₂(aq) and Na₂SO₄(aq) causes exchange of ions: BaCl₂ + Na₂SO₄ → BaSO₄↓ + 2NaCl. Barium sulphate is insoluble in water, so it separates as a white precipitate. Sodium chloride remains dissolved, while barium oxide and sodium oxide are not formed because no oxide ions are present. Hence option A is correct.
Frequently asked questions
What is the correct answer to this question?
Barium sulphate
Why is this the correct answer?
Mixing BaCl₂(aq) and Na₂SO₄(aq) causes exchange of ions: BaCl₂ + Na₂SO₄ → BaSO₄↓ + 2NaCl. Barium sulphate is insoluble in water, so it separates as a white precipitate. Sodium chloride remains dissolved, while barium oxide and sodium oxide are not formed because no oxide ions are present. Hence option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
