Assertion (A): Precipitation reactions produce insoluble salts.Reason (R): Precipitation reaction is a double decomposition reaction.

Assertion (A) is correct. Precipitation reactions do produce insoluble salts. This happens when two soluble salts in solution combine and form a product that cannot dissolve in the solution, thus forming a precipitate.

Reason (R) is also correct. A precipitation reaction is indeed a type of double decomposition reaction. In a double decomposition reaction, the anions and cations of two different molecules switch places, forming two entirely different compounds. In the case of a precipitation reaction, one of these new compounds is insoluble in water and precipitates out of the solution.

However, the reason (R) is not the correct explanation for the assertion (A). While it's true that precipitation reactions are double decomposition reactions, this doesn't explain why they produce insoluble salts. The production of insoluble salts in precipitation reactions is due to the specific reactants used and their solubility rules, not the fact that they are undergoing a double decomposition reaction.