Incorrect statement for addition compound is:

Double salts retain their identity in aqueous solution

The incorrect statement is (4) Double salts retain their identity in aqueous solution.

Double salts are addition compounds that are formed by the combination of two or more stable compounds in stoichiometric proportions. When double salts are dissolved in water, they dissociate into their constituent ions. This means that the double salt loses its identity in aqueous solution.

The other statements are all correct. Simple salts do not lose their identity in double salts, complex compounds retain their identity in aqueous solution, and simple salts lose their identity in complex compounds.