J is a salt of one of the halogens chlorine, bromine, iodine or astatine. The reaction sequence below shows a set of reactions that uses a solution of J as the starting reagent. $\text{J(aq)} \xrightarrow[\text{AgNO}_3(aq)]{\text{HNO}_3(aq)}$ a precipitate $\xrightarrow[\text{dilute NH}_3(aq)]{\text{an excess of}}$ a colourless solution $\xrightarrow[\text{HNO}_3(aq)]{\text{an excess of}}$ a precipitate. Which salt could J be?
- Asodium chloride
- Bsodium bromide
- Cpotassium iodide
- Dpotassium astatide