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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» Solution :Aqua regia which is a mixture of 3 parts of concentrated HYDROCHLORIC acid and 1 part of concentratednitric acid dissolves gold. The man put the gold BANGLES in this solution. The outer dirty layer of gold bangles dissolved in aqua regia bringing out the shining bangles.As the outer layer of bangles dissolved in aqua regia, the weight was REDUCED DRASTICALLY. | |