Which of the following reactions is not a displacement reaction?
Answer and explanation
Correct answer: Reaction of barium chloride and sodium sulphate: \(\mathrm{BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl}\)
In a displacement reaction, a more reactive element replaces a less reactive element from its compound. In options B, C, and D, Fe, Zn, and Mg respectively displace another metal from its salt. In option A, \(\mathrm{Ba^{2+}}\) combines with \(\mathrm{SO_4^{2-}}\) to form a \(\mathrm{BaSO_4}\) precipitate, while the ions exchange partners. Therefore, it is a double-displacement reaction, not a displacement reaction.
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What is the correct answer to this question?
Reaction of barium chloride and sodium sulphate: \(\mathrm{BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl}\)
Why is this the correct answer?
In a displacement reaction, a more reactive element replaces a less reactive element from its compound. In options B, C, and D, Fe, Zn, and Mg respectively displace another metal from its salt. In option A, \(\mathrm{Ba^{2+}}\) combines with \(\mathrm{SO_4^{2-}}\) to form a \(\mathrm{BaSO_4}\) precipitate, while the ions exchange partners. Therefore, it is a double-displacement reaction, not a displacement 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.
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