Oquizy

After adding HCl and barium nitrate, a white precipitate forms. What confirms the identity?

Blue solution confirms copper Effervescence confirms carbonate Precipitate dissolves in excess acid Precipitate is insoluble in acid

Both form white precipitates with sodium hydroxide. How can John distinguish them?

Add HCl – both turn blue Add more NaOH – aluminium dissolves, zinc does not Add more NaOH – zinc dissolves, aluminium does not Add NH₃ – both give brown precipitate

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

Which result confirms the presence of iodide?

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

A glowing splint is inserted into a test tube and relights. What gas is present?

Ammonia Carbon dioxide Hydrogen Oxygen

A pungent gas is produced that turns damp red litmus blue. What gas is it?

Ammonia Chlorine Hydrogen Sulfur dioxide

Quiz: Chemistry - Qualitative Analysis