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Q5
(CISF/2022)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Which one of the following metals is mixed with gold to provide strength to the jewellery ?
Result
Your answer:
—
·
Correct:
D
Explanation
Pure gold (24 karat) is extremely soft and malleable, which makes it unsuitable for crafting durable jewellery as it can easily bend, scratch, or lose its shape. To enhance its hardness, durability, and strength, gold is typically alloyed with other metals.
- Copper is the most common metal mixed with gold for this purpose. It significantly increases the mechanical strength of the alloy.
- Other metals frequently used in gold alloys include silver, zinc, nickel, and palladium. The proportion of these metals determines the karat value (e.g., 22K, 18K) and the color of the gold.
- Mica is a non-metallic mineral, not a metal.
- While Aluminium can be mixed with gold to create "purple gold," the resulting intermetallic compound is very brittle and not used for providing structural strength in standard jewellery.
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