It is known that a powder is either one sodium halide or a mixture of two sodium halides. A portion of the powder was dissolved in water. When aqueous silver nitrate was added, a pale yellow precipitate was produced. On adding concentrated aqueous ammonia, part of the precipitate dissolved, with a darker yellow precipitate remaining. What could the powder have been made up of?
- Asodium bromide only
- Bsodium iodide only
- Ca mixture of sodium chloride and sodium bromide
- Da mixture of sodium chloride and sodium iodide