. One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
The gold jewellery must be dipped in a liquid called aqua regia, that is a mixture of hydrochloric and nitric acid, to polish it.
