Advanced Quiz on Group 1 Cations (Ag⁺, Pb²⁺, Hg₂²⁺) Choose the best answer and click “Submit” to check your score and explanations! 1. How can Pb²⁺ be separated from Ag⁺ and Hg₂²⁺ after precipitation as chlorides? A. By dissolving in dilute nitric acid B. By dissolving in hot water C. By dissolving in excess ammonia D. By dissolving in NaOH 2. How is Ag⁺ separated from Hg₂²⁺ after precipitation as chlorides? A. By hot water extraction B. By excess ammonia solution C. By dilute acetic acid D. By potassium iodide solution 3. What confirms Pb²⁺ in the hot water extract? A. Formation of white precipitate with HCl B. Formation of yellow precipitate with KI C. Formation of black precipitate with ammonia D. Formation of brown precipitate with NaOH 4. What happens when Hg₂Cl₂ is treated with ammonia? A. It dissolves completely B. It forms a yellow solution C. It turns black D. No reaction 5. Why doesn’t PbCl₂ dissolve in excess ammonia? A. Pb²⁺ does not form a stable ammine complex B. PbCl₂ is strongly basic C. PbCl₂ decomposes immediately D. It forms a black precipitate instead 6. How is Ag⁺ confirmed after dissolving AgCl in ammonia? A. By heating with NaOH B. By adding dilute HCl again C. By acidifying with nitric acid to reprecipitate AgCl D. By adding KI solution 7. Which chloride is called calomel? A. AgCl B. PbCl₂ C. Hg₂Cl₂ D. HgCl₂ Submit
