Chapter 3: Metals and Non-metals

Q&A -Ask Doubts and Get Answers

Q
Metals and Non-metals

Question:

 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 repeat. Can you play the detective to find out the nature of the solution he has used?

Answer:

Aqua regia is the mixture of corrosive liquid which is made by mixing three parts of concentrated hydrochloric acid and one part of concentrated nitric acid. It is commonly used in the refining of gold. The dishonest goldsmith dipped the gold bangles in the aqua regia solution. When he dipped the gold bangles in the aqua regia, the outer layer of the gold dissolved in the solution while the inner shiny layer of the gold appears. That is why the weight of the gold bangles are reduced.


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