A silver spoon develops a black coating of Ag₂S after prolonged exposure to air
CHEMISTRY · Subjective · CBSE · Chemistry · Is Matter Around Us Pure? · Is Matter Around Us Pure?
Problem
A silver spoon develops a black coating of Ag₂S after prolonged exposure to air. The spoon is later polished with a cloth to restore its shiny surface.
(i) Tarnishing of the silver
(ii) Polishing of the spoon
For each process, state whether it is a chemical change, a physical change, or both, and briefly justify your answer.