a shiny silver article generally turn black when kept in open for a few days. the article when rubbed with toothpaste again start shining.name the phenomenon involved. name the black substance formed and give its chemical formula

a shiny silver article generally turn black when kept in open for a fe

1.	a shiny silver article generally turn black when kept in open for a few days. the article when rubbed with toothpaste again start shining.name the phenomenon involved. name the black substance formed and give its chemical formula
Answer» PHENOMENON is rusting. Black SUBSTANCE formed is rust of silver. Chemical formula is written above.