Question

The percentage of gold in 24 carat gold is
(A) $99.99$
(B) $91.6$
(C) $75$
(D) $95$

Answer 1

Hint:The purity of gold is measured by carat. The high value of carat has high purity of gold. The color of gold also shows its purity. The cost of the gold is directly proportional to purity. Apart from $24$ it defines many more carats also.

Complete step by step answer:
-Gold is one of the precious elements of the periodic table. Its atomic number is $79$ and the symbol is Au. It is the least reactive metal like silver and platinum. It is found in nature in the form of ore. Ores are purified by some purification methods like Wohlwill and Miller.
-Miller- In this process, when ore of gold is in a molten state then chlorine gas is used to purify the metal.
Wohlwill-It is an electrolysis process in which impure gold is deep into the electrolyte solution. After this process, we can get $99.99\% $ pure gold. The electrolyte is the solution of hydrochloric acid and gold chloride.
-Carat-It is the unit of purity. It is used to find the fineness and purity of gold. It is used to measure the purity of gemstone, pearl. It is equal to nearby $200mg$. $24$ carat is the maximum purity, which means $99.99\% $ pure gold.

Hence, option A is the correct answer.

Note:
Gold has the highest malleability and ductility property. Malleability means metal can convert into a thin sheet. Ductility means metal can drown into thin wire. Jewelry made of gold and silver. And gold is the least reactive metal. Aqua regia is used to purify the jewelry. It is the solution of hydrochloric acid $HCl$ and nitric acid $HN{O_3}$.