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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.


Solution

The black substance is formed because silver (Ag) reacts with $$H_{2} S$$ present in the air. It forms a thin black coating of silver sulphide $$\displaystyle(A g_{ 2} S)$$ 
1691476_1791281_ans_abd57af5989047c3837528f57a83e1f6.jpg

Chemistry

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