In a qualitative cation analysis,the unknown ion is precipitated by HCl(aq),remains as a chloride solid in hot water,and the precipitate turns black upon addition of aqueous ammonia.The unknown ion is ________. A)Hg₂²⁺ B)Pb²⁺ C)Ag⁺ D)K⁺ E)Cd²⁺

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The unknown ion is Hg2+ because it forms a precipitate with HCl, which does not dissolve in hot water, and turns black upon addition of aqueous ammonia, indicating the formation of a mercury-ammonia complex.

In a Qualitative Cation Analysis,the Unknown Ion Is Precipitated by HCl(aq),remains