Answer: B. False
Explanation: A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
Example:
[tex]2NaOH(aq)+(NH_4)_2SO_4(aq)\rightarrow 2NH_4OH(aq)+Na_2SO_4(aq)[/tex]
Thus as we can see sodium ion [tex]Na^+[/tex] is being replaced by ammonium ions [tex]NH_4^+[/tex] and thus positive ions replace positive ions only and not negative ions.
