Question

name the reaction which forms insoluble solid

Answer 1

A precipitation reaction occurs when an ionic substance comes out of solution and forms an insoluble (or slightly soluble) solid. The solid which comes out of solution is called a precipitate. This can occur when two soluble salts (ionic compounds) are mixed and form an insoluble one—the precipitate.

Answer 2

A Precipitation reaction
gives you insoluble salt .