Question

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 they turn black? 1

b)Name the black substance formed and write its formula 1

c) Name the phenomenon involved​

Answer 1

Answer:

Silver article turns black when kept in the air because silver article reacts with Sulphur compounds such as hydrogen sulphide (H2S) present in air. The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver.

Step-by-step explanation:

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Answer 2

Answer:

here is your answer hope this is helpful from you