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Standard 18–carat gold sold in the market is
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- 82 parts gold and 18 parts other metal
- 18 parts gold and 82 parts other metal
- 18 parts gold and 6 parts other metal
- 9 parts gold and 15 parts other metal
- 82 parts gold and 18 parts other metal
Correct Option: C
The carat or karat (symbol: K or kt) is a unit of purity for gold alloys. Carat purity is measured as 24 times the purity by mass. Therefore, 24-Carat gold is fine (99.9% Au w/w), 18-Carat gold is 18 parts gold 6 parts another metal (forming an alloy), 12-Carat gold is 12 parts gold (12 parts another metal), and so forth.
