Question

Q.38. A silver article generally turns black when
kept in the open for a few days. The article
when rubbed with toothpaste again starts
shining.

(a) Why do silver articles turn black when
kept in the open for a few days? Name
the phenomenon involved.

(b) Name the Black substance formed and give its chemical formula.

please give answer with explaination. thank you​

Answer 1

a. phenomenon involved is corrsion. the silver reacts with the H2S content in the atmosphere and forms a different compound.

b. the black substance is silver sulphide, with chemical formula Ag2S