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 $$\displaystyle(A g_{ 2} S)$$ Chemistry

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