One day upasana went to jweller shop with her mother to give gold jewellery to goldsmith to polish. Next day when they bought jwellery back they dound tgat there was a sloght loss in its weight. Can you guess why
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Explanation:
The goldsmith polish the gold by dipping it in aqua regia so that the dull layer can be removed and shiny layer comes up. But this causes weight change because some of the gold is dissolved and remain in aqua regia.
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