A man went door to door posing to be a goldsmith. He promised to bring back the glitter of old and dull gold ornaments.

Monjur Alahi

A man went door to door posing to be 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.

(i) Can you play the detective to find out the nature of the solution he had used?

(ii) What is 24 carat gold?


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Salim Ahmed Kawsar

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(i) The nature of the solution is acidic. It is a mixture of conc. HNO3 and conc. HCI in the ratio of 1 : 3. It can dissolve gold as it is an oxidising agent. 

(ii) Pure gold is 24 carat gold which is very soft.

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