Question

black substance that is formed due to corrosion of silver​

Answer 1

silver sulphide

Silver turns black when kept in the air because it reacts with sulphur compounds such as hydrogen sulphide (H2S) present in air. The phenomenon is called corrosion and, for silver in particularly, is called tarnishing. The black substance formed is silver sulphide.

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Answer 2

Answer is silver sulphide