Which of the following halide precipitates is white?

The answer is silver chloride, which is known for forming a white precipitate when solutions containing silver ions and chloride ions react. In a laboratory setting, silver chloride appears as a fine white powder or precipitate.

When silver nitrate is added to a solution containing chloride ions, a reaction occurs, resulting in the formation of silver chloride and soluble sodium nitrate or other similar compounds, depending on the chloride source. The aspect of whiteness for silver chloride is significant because it can help in visual identification during qualitative analysis.

In contrast, silver bromide and silver iodide produce yellow and cream-colored precipitates respectively, while silver sulfide generates a black precipitate. Therefore, silver chloride stands out as the only halide in this list that is distinctly white when formed as a precipitate.