What is the main characteristic of a double displacement reaction?
Exchange of ions between reactants
In a double displacement reaction two compounds exchange their ions to form two new compounds, as in AB + CD → AD + CB.
For example, Na2SO4 + BaCl2 → BaSO4 + 2NaCl, where the sulphate and chloride ions swap partners.
Breaking a compound into simpler substances is decomposition, combining two elements is a combination reaction, and removal of hydrogen from an acid is a property of oxidation - none of these involves an exchange of ions.
Hence, the answer is exchange of ions between reactants.
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Fe + H2O4 → Fe3O4 + H2
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Important Questions from Chemical Reaction
- Which of the following is NOT an example of combination reaction?
- In a redox displacement reaction, if element X loses electrons and element Y gains electrons, then:
- What is the general name of the reaction between an acid and a base?
- When iron filings are mixed with sulfur powder and the mixture is heated, a black substance called iron sulfide is formed. Which statement best describes the changes involved?
- When an iron nail is dipped in copper sulphate solution, which of the following observations confirms that a displacement reaction has occurred?
