Question

A silver article generally turns black when kept in the open for few days the article when rubbed with toothpaste . Why do silver articles turn black. 2 name the black substance formed with its molecular formula 3 why it again starts shining by rubbing with toothpaste

Answer 1

The compound is AgCO3 which is black in colour.When the article is rubbed with toothpaste , which is a base, it takes away the CO2 from it, which is acidic.

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