Hydrogen sulfide (H2S) on reacting with an aqueous solution of metal salts converts them to ---------------
Hydrogen sulphide (H2S) reacting with an aqueous solution of metal salts converts them to Metal sulphide.
Example:- Aqueous solution of Copper sulphate (CuSO4) react with Hydrogen sulphide(H2S) gives a black precipitate of Copper sulphide (CuS) and Sulphuric acid (H2SO4)
Therefore Hydrogen sulphide (H2S) reacting with an aqueous solution of metal salts converts them to Metal sulphide with colour.