The percentage of pure gold in 18-carat gold is

Correct option is B

Gold purity is measured in carats, with 24-carat gold being the purest form, containing 100% gold. The carat value indicates the proportion of pure gold in the alloy. For 18-carat gold:
 24 carats represent 100% gold.
 Therefore, 18 carats out of 24 is equivalent to 1824×100\frac{18}{24} \times 1002418​×100 which equals 75%.
This means that 18-carat gold contains 75% pure gold, with the remaining 25% being other metals like copper or silver, which are added to increase its strength and durability since pure gold is quite soft.
Information Booster: ● 24-carat gold is 100% pure, but it's very soft and not suitable for making jewelry.
● 18-carat gold is often used in jewelry because it balances purity and durability.
● The addition of other metals like copper or silver to 18-carat gold enhances its strength and changes its color.
● 22-carat gold contains approximately 91.67% pure gold, commonly used in traditional jewelry in many cultures.
Additional Knowledge:
 (a) 60%: Incorrect, as this percentage would correspond to approximately 14-carat gold, not 18-carat.
 (b) 75%: Correct, as explained, 18-carat gold has 75% pure gold content.
 (c) 80%: This would not correspond to any standard carat level for gold purity.
 (d) 100%: This is the purity level for 24-carat gold, not 18-carat.
This detailed explanation confirms why 75% is the correct answer and provides insights into gold purity and its uses.