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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?

Answer :

Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ration 3:1.It can dissolve gold. It is a corrosive fuming liquid. That's why it is used to clean gold and platinum too. And after cleaning gold along with impurities, it will shine but its weight become slightly less.

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