Question

When the gold ornaments are sent to a jeweller for polishing, they always lose a small amount of
weight. Find out the reason and explain how does this happen.​

Answer 1

Answer:

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 jewellery.