Which observation indicates that a reaction occurs when aqueous barium chloride and sodium sulphate solutions are mixed?
Answer and explanation
Correct answer: Formation of a white precipitate
On mixing the solutions, ions exchange: \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Barium sulphate is insoluble in water, so it appears as a white solid precipitate. Gas evolution or a flame is not characteristic of this double-displacement precipitation reaction.
Frequently asked questions
What is the correct answer to this question?
Formation of a white precipitate
Why is this the correct answer?
On mixing the solutions, ions exchange: \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Barium sulphate is insoluble in water, so it appears as a white solid precipitate. Gas evolution or a flame is not characteristic of this double-displacement precipitation reaction.
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.
