MCQ Detailed View

Gold (Au) and Silver (Ag) are unique metals that hold important places in chemistry, history, and human society. They are classified as both coinage metals and noble metals because of their special properties.

1. Coinage Metals:
The term "coinage metals" traditionally refers to a group of metals used in making coins, mainly copper (Cu), silver (Ag), and gold (Au). These metals were chosen for coins because they are relatively soft, easy to shape, resistant to corrosion, and maintain their shine. Gold and silver, in particular, were highly valued for currency since ancient times due to their rarity and stability.

2. Noble Metals:
Gold and silver are also called noble metals. Noble metals are elements that resist corrosion and oxidation, even in moist air. They do not tarnish or rust easily and remain chemically stable for long periods. This property makes them suitable for jewelry, ornaments, and electrical applications where durability is important. Other noble metals include platinum, palladium, and rhodium.

The reason gold and silver fall into both categories is that they share the qualities of coinage metals (historical use in money-making) and noble metals (resistance to chemical attack). Their excellent electrical conductivity also makes them valuable in modern industries, such as electronics and medical devices.

Looking at the options:

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  Coinage metals (A) is correct because both gold and silver were used in coins.

  
  


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  Noble metals (B) is correct because they are chemically unreactive and resistant to corrosion.

  
  


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  Hence, the best answer is Both A & B.

  
  

In summary, gold and silver are simultaneously coinage metals and noble metals, making them exceptional elements in both chemistry and history.