The compound that is white in color is

We need to identify which compound is white in color.

Analysis of each compound:

- Ammonium sulphide: $$(NH_4)_2S$$ is colorless in solution (may appear yellowish due to polysulfides). Not a white solid in typical form.

- Lead sulphate: $$PbSO_4$$ is a white crystalline solid. It is an insoluble white precipitate commonly encountered in qualitative analysis.

- Lead iodide: $$PbI_2$$ is yellow in color (bright yellow precipitate).

- Ammonium arsinomolybdate: This is yellow in color (canary yellow precipitate, used in testing for arsenic).

The correct answer is Option (2): lead sulphate.