Question

silver compounds react with sulphur to form black layer. give reason.

Answer 1

ilver articles become black on exposure to air for sometime. When silver articles exposed to air silver racts with sulphur present in the atmosphere and form a black layer of silver sulphide on the surface.

Copper articles get tarnished by reacting with air and water. Due to this, a layer is formed over copper vessels. This layer mainly contains black copper oxide and green copper hydroxide.

Answer 2

Hii There!!

When silver metal is exposed to air. It reacts with atmospheric "Sulphur Gas ".

Here is the chemical reaction taking place:-
=> Ag + S2-----> Ag2S

This layer is generally unreactive and this is a result of photolysis decomposition reaction.

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