hydrogen - squeaky pop, oxygen - relight a glowing splint, carbon dioxide - limewater cloudy, chlorine - bleaches damp blue litmus paper, lithium - crimson flame, sodium - yellow flame, potassium - lilac flame, calcium - orange-red flame , white precipitate - sodium hydroxide , copper - green flame , iron (II) - green precipitate- sodium hydroxide , iron (III) - brown precipitate- sodium hydroxide , copper (II) - blue precipitate- sodium hydroxide , magnesium - white precipitate- sodium hydroxide , aluminium - white precipitate- sodium hydroxide until in excess, chloride ions  - nitric acid - silver nitrate - white precipitate , bromide - nitric acid - silver nitrate - cream precipitate, iodide - nitric acid - silver nitrate - yellow precipitate , sulfate - HCL - Barium Chloride- white precipitate ,

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