Question

Why it is necessary that every double displacement reaction is precipitation reaction but not every precipitation reaction is double displacement reaction ​

Answer 1

Explanation:

No, recall the definition of a precipitate "insoluble ionic compound". Take this reaction into consideration

NaOH (s)+HCl (l)↽⇀H2O (l)+NaCl (aq)

none of the products are insoluble. You'll learn more when you go over gas evolution reactions.

Answer 2

Answer:

in double displacement reaction there is exchange of Ions between reactant to form precipitation . in precipitation reaction there no exchange of ions between reactant but precipitation is formed. so every double displacement reaction is precipitation reaction but no every precipitation reaction is double displacement reaction.