Question

silver articles turn black when kept in air for some days.which of the following compounds is primarily responsible for it ? A-AgCL B-Ag2O C-Ag2S D-Ag2CO3

Answer 1

Hi...
The answer is...
C. Ag2S

Answer 2

The answer is - c. Ag2S

When silver articles are exposed to air they become black after sometime. The reason for this is that the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide. As a result, a layer of silver sulphide or Ag2S is formed on the surface of the silver articles. So the articles appear to be dull and black. It is referred to as corrosion or tarnishing of silver.