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Question

What are the favorable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?


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Solution

Pure gold:

  • A 24 Karat gold is 100% pure gold and does not have any other metal mixed.
  • It is ductile as well as malleable in nature.

An Alloy of Copper Cu and Gold Au:

  • Tumbaga is an alloy made up of gold and copper.
  • The melting point of this alloy is lower than gold or copper alone and also it is more malleable thus it is used for making ornaments.
  • It could range from 95% copper to 95% gold.

An Alloy of Silver Ag and Gold Au:

  • The alloy of silver and gold is known as Electrum.
  • It is made up of 20% silver and 80% of gold.
  • It is soft and malleable thus, it is used in making coins and ornaments.

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