Which of the following reactions is both a double displacement reaction and a precipitation reaction?
Answer and explanation
Correct answer: BaCl_2(aq) + Na_2SO_4(aq) → BaSO_4(s) + 2NaCl(aq)
In reaction A, Ba^{2+} and Na^+ exchange partners, so it is a double displacement reaction. Insoluble white BaSO_4 forms as a precipitate, so it is also a precipitation reaction. In contrast, option B is a combination/oxidation reaction of magnesium, not an exchange of ions.
Frequently asked questions
What is the correct answer to this question?
BaCl_2(aq) + Na_2SO_4(aq) → BaSO_4(s) + 2NaCl(aq)
Why is this the correct answer?
In reaction A, Ba^{2+} and Na^+ exchange partners, so it is a double displacement reaction. Insoluble white BaSO_4 forms as a precipitate, so it is also a precipitation reaction. In contrast, option B is a combination/oxidation reaction of magnesium, not an exchange of ions.
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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