Question

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. Name the black substance formed and give its chemical formula :

• A. Silver oxide, ($A{g}_{2}O$)
• B. Silver chloride, ($AgCl$)
• C. Silver sulphide, ($A{g}_{2}S$)
• D. Silver iodide,($AgI$)

Answer 1

The correct option is C Silver sulphide, ($A{g}_{2}S$)

Silver(Ag) reacts with hydrogen sulphide($H_{2}S$) in the presence of humidity and moisture to form black coloured layer of silver sulphide($A{g}_{2}S$)

Hence the correct option is C.