Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids. Because not all aqueous reactions form precipitates, one must consult the solubility rules before determining the state of the products and writing a net ionic equation. The ability to predict these reactions allows scientists to determine which ions are present in a solution, and allows industries to form chemicals by extracting components from these reactions.
Answer: 1. Option (A) is the correct answer.
2. Option (D) is the correct answer.
Explanation:
When there is formation of an insoluble salt due to chemical reaction where two ions combine together in an aqueous solution then this insoluble salt is known as precipitate.
Therefore, chemical precipitation occurs when a product is insoluble and precipitates out of a solution.
Whereas reactants dissolve in precipitation reaction that is why a chemical reaction takes place in which an insoluble product is formed.
For example, [tex]AgNO_{3}(aq) + NaCl(aq) \rightarrow AgCl (ppt) + NaNO_{3}(aq)[/tex]
Here AgCl is the precipitate which is insoluble.
Thus, we can conclude the following.
