Question

one day, Neeta went to a jewellery shop with her mother, her mother gave an old jewellery to the goldsmith to polish. Next day when they brought the jewelry back, they found that there was a slight loss in its weight. can you suggest a reason for the loss in weight? *

Answer 1

Answer:

Gold ornaments are polished in a solution of aqua regia (mixture of nitric acid and hydrochloric acid). The outer layer of the gold dissolves in the acidic solution and the inner shiny layer is visible. Because of loss of upper layer of jewellery the weight of ornaments is reduced.

Answer 2

Answer:

In order to polish the gold ornament, it is to be dipped into a liquid called aqua regia (a mixture of hydrochloric acid and nitric acid). On getting dissolved in the environment of aqua regia, the outer layer of gold dissolves and an inner shiny layer appears. The dissolving of the layer causes a reduction in the weight of the jewellery.