Group IV Cation Analysis Quiz 1. What is the group reagent for Group IV cations? NH₄Cl + NH₄OH + (NH₄)₂CO₃ HCl + H₂S NaOH + H₂O₂ Na₂CO₃ + NH₃ 2. What is the color of the precipitate formed by Ba²⁺ with K₂CrO₄? Yellow White Green Orange 3. The yellow precipitate of BaCrO₄ is soluble in: NaOH Acetic acid Water HCl 4. Which salt confirms Sr²⁺ after Ba²⁺ is removed? SrSO₄ SrCO₃ SrCl₂ Sr(NO₃)₂ 5. Ca²⁺ is confirmed by formation of which white precipitate? CaC₂O₄ CaSO₄ CaCO₃ CaCl₂ 6. Which acid is used to dissolve Group IV carbonates before confirmatory tests? Dil. HCl Concentrated HNO₃ NH₄OH Sulfuric acid 7. How is Ba²⁺ separated from Sr²⁺? By K₂CrO₄ to form BaCrO₄ By (NH₄)₂SO₄ By flame test By adding NH₄OH 8. SrSO₄ is: Insoluble (white ppt) Soluble in (NH₄)₂SO₄ Soluble in water Blue colored salt 9. CaSO₄ is: Soluble in (NH₄)₂SO₄ Soluble in water Forms red ppt Show green color by flame 10. Ca²⁺ reacts with (NH₄)₂C₂O₄ to form: CaC₂O₄ (white ppt) CaCO₃ Ca(NO₃)₂ CaSO₄ 11. Why is dil. HCl used before flame test? To make the salt volatile To oxidize the cation To remove color It’s a reducing agent 12. Which ion shows a brick-red flame? Ca²⁺ Ba²⁺ Sr²⁺ Mg²⁺ Submit
