When two aqueous solutions are mixed, a white precipitate of barium sulphate forms and sodium chloride remains in solution. Which pair of reactants is correct?
Answer and explanation
Correct answer: Barium chloride and sodium sulphate
In the double-displacement reaction between barium chloride and sodium sulphate, insoluble white barium sulphate is formed:
\(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\).
Therefore, sodium chloride remains in solution. Option B can also form a white precipitate, but it is calcium carbonate, not barium sulphate.
Frequently asked questions
What is the correct answer to this question?
Barium chloride and sodium sulphate
Why is this the correct answer?
In the double-displacement reaction between barium chloride and sodium sulphate, insoluble white barium sulphate is formed:
\(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\).
Therefore, sodium chloride remains in solution. Option B can also form a white precipitate, but it is calcium carbonate, not barium sulphate.
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.
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