Question

When gold ornaments are sent to a jeweller for polishing they always lose small amount weight why

Answer 1

bcoz polishing the ornaments they are first cleaned thoroughly using aqua recia which have the capability to disolve noble metals thus the net wt gets reduced

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Answer 2

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.