Compare7 marksChallenge
A student is given a colourless solution thought to contain a halide salt. A sample is acidified with dilute nitric acid and then aqueous silver nitrate is added. A pale yellow precipitate forms. The precipitate does not dissolve when dilute aqueous ammonia is added, but it does dissolve when concentrated aqueous ammonia is added. In a separate test, another sample of the solution is treated with concentrated sulfuric acid. A pungent gas is produced that turns moist blue litmus paper red, and a yellow solid forms.