10th Class Science Metals and Non-metals Question Bank 10th CBSE Science Metals and Non-metals

  • question_answer   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?


                      Goldsmith dipped the set of the gold bangles in aqua regia solution. Aqua regia is a freshly prepared mixture of 1 part of cone. HNO3 and 3 parts of cone. HCl by volume. Aqua regia dissolved a considerable amount of gold from the dipped gold bangles and hence reduced their weight drastically. The goldsmith (dishonest) can recover the dissolved gold from aqua regia by a suitable treatment.

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