one day soniya and her mother went to the jeweler.her mother gave an old gold jewellery to the gold smith.next day when they brought back the found that there was a slight loss in its weight can you suggest a reason for the loss in weight.
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Answer:
The jeweller probably scraped off some gold from the jewellery.
OR
When he tried to clean it.... the Corroded portion of the jewellery came out of it.
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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 the aqua regia the outer layer of gold is dissolved and the inner shiny layer appears the dissolving of the layer causes a reduction of weight of the jewellery. after that they change it into solid and sell it,
aqua regia can dissolve platinum and gold
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