Riya wants the shiny artificial gold jewellery. For that purpose, she was having one nice copper necklace. How will she obtain the shiny necklace from the same copper necklace? Name the procedure and also write down, what kind of electrode should she use and where she should attach the copper necklace?
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To polish a gold ornament, it is dipped in a liquid called aqua regia (a mixture of hydrochloric acid and nitric acid). On getting the environment of aqua regia, the outer layer of gold dissolves, and the inner shiny layer appears. The dissolving of the layer causes a reduction in the weight of the jewelry.
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