Question

When it is kept for some days, its shining appearance is lost. Why?​

Answer 1

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it's because they are exposed to water an other atmospheric gases. due to this they react with them and loose their shine

Answer 2

Explanation:

silver ornaments lose their shine when kept for some time. since they under go corrosion over a period of time. silver reacts with sulphur when kept in the open and a black coating of silver sulphide is developed in the silver sulphide is developed on the silver ornaments which gives the effect of the silver lossing its shine