Question

A jeweler is selling 22-carat gold articles with $95\% $ purity, it is approximately.
A.exact
B.$33.3\% $ higher
C.$33.3\% $ lower
D.$5\% $ lower

Answer 1

Hint:
-Gold is an element with atomic number 79 and its electronic configuration is $\left[ {Xe} \right]4{f^{14}}5{d^{10}}6{s^1}$.
-It is a soft, bright, dense, malleable, and ductile metal with a slightly reddish yellow.
-It is a very good conductor of heat and electricity and it does not get affected by air and most reagents.
-Usually, common gold compounds include chloroauric acid and auric chloride.

Complete step by step answer:
Carat is a unit that is used to define the purity of gold. 24-carat gold is said to be $100\% $ pure.
In the question, it is said that the jeweler is selling 22-carat gold articles which means that the gold is a little less pure. Along with gold other metals like copper are also added.
Let us calculate the purity of gold.
We know that the purity of 24-carat gold is $100\% $.
So the purity of 22- carat gold $ = \dfrac{{22}}{{24}} \times 100$
The purity of 22 carats gold $ = \dfrac{{275}}{3}$
The purity of 22-carat gold $ = 91.66\% $
Thus, the purity of 22- carat gold is $91.66\% $
Therefore, the purity of gold given by the jeweler $ = \left( {95 - 91.66} \right)\% $
The purity of gold given by the jeweler $ = 3.33\% $ higher
After discussing it we can conclude that the jeweler selling 22- carat gold articles are giving $3.33\% $ higher purity.

Thus, the correct option is (B).

Note: Uses of Gold
-Gold is mainly used for the making of ornaments, glass, and different parts of electronics items.
-It is also used in medicine. The radioisotope of gold $Au - 198$ is used in the treatment of the tumor.
-It is often used as a coloring agent in cranberry glass, where it is known to produce a very deep and intense red color.
-It is widely used in the electronics industry for the fabrication of electrical connectors that are resistant to corrosion and these electrical connectors are known to be employed in many electrical devices such as computers.