Which of the following statements is true about precipitation reaction?

Correct option is D

The correct answer is: (D) An insoluble salt is formed.

Explanation:

A precipitation reaction is a type of chemical reaction where two soluble salts react in an aqueous solution to form an insoluble salt that precipitates out of the solution.

For example:

                 $$\text{AgNO}_3 (aq) + \text{NaCl} (aq) \rightarrow \text{AgCl} (s) + \text{NaNO}_3 (aq)$$​

In this reaction, silver chloride (AgCl) is the insoluble salt that forms and precipitates out of the solution, while the other product (NaNO₃) remains soluble in the solution.

So, the defining feature of a precipitation reaction is the formation of an insoluble salt, which answers the question correctly.