Advanced Chemistry Quiz: Group II Cations Advanced Chemistry Quiz: Group II Cations 1. How can HgS be separated from Bi2S3? Add NH₄OH to form Bi(OH)₃ Boil with dilute HNO₃: Bi³⁺ dissolves, HgS remains Add NaOH to form Hg(OH)₂ Precipitate both as chlorides 2. How can Bi3+ be separated from Cu²⁺? Bi3+ will give white ppt in ammonium hydroxide; CuS dissolves Cu²⁺ precipitates first Use KCN Precipitate both as hydroxides 3. What is used to separate Group IIA from Group IIIB cations? HCl NH₄Cl H₂S in presence of HCl Boil yellow ppt with KOH 4. Which reagent confirms Bi³⁺? NaOH SnCl₂ K₄[Fe(CN)₆] Sodium stannite (Na₂Sn(OH)₄) 5. Cu²⁺ is confirmed by reaction with: K₄[Fe(CN)₆] — red ppt NH₄Cl — white ppt Na₂S₂O₃ — brown ppt SnCl₂ 6. Reaction of Hg²⁺ with SnCl₂ gives: Yellow ppt White Hg₂Cl₂ → black metallic Hg (prolonged) Red ppt of HgO Green ppt of Hg(OH)₂ 7. CdS can be separated from SnS₂ or As₂S₃ by: Using HCl HgCl2 solution Boiling with KOH Using alcohol 8. What is the electronic configuration of Bi³⁺? [Xe] 4f¹⁴ 6s² 6p³ [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³ [Xe] 4f¹⁴ 6s² [Xe] 4f¹⁴ 5d¹⁰ 6s² 9. Arsenic belongs to which group in the periodic table? Group 15 (Pnictogens) Group 14 Group 16 Group 13 10. Which is a disease caused by arsenic poisoning? Beriberi Rickets Blackfoot disease Pellagra Submit Answers
