Question

why do silver articles shine when rubbed with toothpaste​

Answer 1

Answer:

As toothpastes consist of several abrasive substances (like, Aluminium hydroxide), this layer of silver sulphide can be removed by rubbing the article with toothpaste. This reaction leaves the silver metal all shiny. This particular cleaning process can be improved by using hot water and sodium bicarbonate.

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Answer 2

Answer:

due to redox reaction it's upper surface get corrised and forming a black layer on washing the layer will remove and get shinning