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A woman gave old and dull gold bangles to a goldsmith for polishing to restore their glitter. The goldsmith dipped the gold bangles in a particlular solution. The bangles sparkled like new but their weight was reduced drastically. Can you guess the solution used by the dishonest gold smith.?

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The dishonest goldsmith dipped the gold bangles in aqua-regia solution (which contains 1 part of concentrated nitric acid and 3 parts of concentrated hydrochloric acid, by volume). Aqua-regia dissolved a considerable amount of gold from gold bangles and hence reduced their weight drastically. The dishonest goldsmith can recover theh dissolved gold from aqua-regia by a suitable treatment.

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