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A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
The man used an aqua-regia solution, a mixture of , in a molar ratio. The gold's outer layer dissolves, and the shiny inner layer appears after dipping the gold jewellery in the acid solution. As a result, it loses weight.
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