A compound was found to be soluble in water. It was also found that addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide.Which one of the following cations would form a precipitate when added to an aqueous solution of this compound? A)NH₄⁺ B)K⁺ C)Cr³⁺ D)Rb⁺ E)Na⁺

Question

Quizplus · Accepted Answer

The formation of carbon dioxide indicates the presence of carbonate ions (CO32-). Only metal cations that form insoluble carbonates will form a precipitate when added to the solution. Among the given options, Cr3+ is the only metal cation that forms an insoluble carbonate. Therefore, option C (Cr3+) would form a precipitate in the solution.

A Compound Was Found to Be Soluble in Water