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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Important Questions from Chemical Reaction
Which of the following statement is/are true?
I. In physical change new substance is formed. substance is formed.
II. In chemical change no new substance is formed.
Which of the following cells involves similar chemical reactions?
The information not obtained from balanced chemical equation is
Oxygen cannot be obtained by which one of the following methods?
Which of the following compound is responsible for tarnishing of silver?
