Oquizy

Zinc and lead both form white ppt with NaOH. How can they be distinguished?

Add excess NaOH: zinc dissolves, lead remains Add NaOH: only lead dissolves Add NH₃: only lead dissolves Flame test: both give red flame

John has a test tube containing a colourless solution. These are the observations he made
- White ppt forms with NaOH
- Precipitate dissolves in excess NaOH
- Add NH₃: white ppt again, also dissolves in excess. What cation is present?

Aluminium Calcium Lead Zinc

Which test confirms the presence of carbon dioxide?

Damp red litmus turns blue Glowing splint relights Lighted splint gives pop Turns limewater milky

Which result confirms the presence of iodide?

Cream ppt with AgNO₃ No reaction with AgNO₃ White ppt with AgNO₃ Yellow ppt with AgNO₃

Which of the following correctly identifies the test result for chloride ions?

Effervescence with HCl White precipitate with AgNO₃ White precipitate with Ba(NO₃)₂ Yellow precipitate with AgNO₃

Which reagent is used in the test for nitrate ions?

Aqueous ammonia and bromine water Barium chloride and HCl Silver nitrate and nitric acid Sodium hydroxide and aluminium foil, then warm

Quiz: Chemistry - Qualitative Analysis