Oquizy

Which of the following confirms the presence of hydrogen gas?

Damp red litmus paper turns blue Glowing splint relights Lighted splint gives a 'pop' sound Limewater turns milky

Which reagent is best used to test for unsaturation in organic compounds?

Acidified potassium manganate(VII) Aqueous bromine Barium nitrate Dilute nitric acid

A student adds dilute HCl to a white solid. Effervescence occurs. What does this confirm?

Carbonate present Chloride present No conclusion Sulfate present

Ammonium ions are present in a solution. What confirms this?

Brown precipitate forms Light blue precipitate forms Pungent gas turns red litmus blue upon warming with NaOH White precipitate with dilute HCl

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

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

Quiz: Chemistry - Qualitative Analysis