Question

a silver article turns black when kept in open for few days and it again start shining when rubbed with toothpaste . Name black substance formed and give its formula.Why do silver articles turn black when kept in open for few days .Name the phenomenon involved.

Answer 1

Silver becomes black and tarnished when exposed to open air as it does not react with the ...atmospheric oxygen or water vapours but silver reacts with the ...atmospheric sulphur to form silver sulphide ..which appears black nd tarnished .The phenomenon involved here is that of corrosion ...

Answer 2

Silver Objects turn black when exposed to air due to corrosion. This happens because silver reacts with Hydrogen Sulphide, present as a pollutant in the air, to form a black coating of Silver Sulphide(Ag2S)...