Question

In 300-200 B.C. era, the use of coins by Greek and Indian civilizations was observed. The element used for making coins are:
A. $Fe$
B. $Pb$
C. $Al$
D. $Sn$

Answer 1

To solve this question, it is necessary to know the characteristic properties of the combining metals as well as the finally formed alloy. The physical and chemical properties of the alloy determine the use case of the alloy.

Complete step by step answer:
We must remember that an alloy is a mixture of two or more metals, or a metal and a non-metal in a fixed quantity. Since it is a mixture of two or more metals, it derives various characteristics from these metals, to find the perfect metallic compound for a certain use case. The alloys formed by the metals in the options given are as follows;

Option A: steel is an alloy of iron with small amounts of carbon. There are three main alloys used in the manufacture of coins are nickel based, copper based and bronze based. Therefore, the option A is incorrect.

Option B: the elements utilized in making coins by Greek and Indian civilizations was led. Lead has been known to have poor creep characteristics and is also quit heavy.
Therefore, the option is correct.

Option C: the addition of aluminium helps improve this resistance to creep. It also efficiently optimises the electrical conductivity and also helps in reducing density.
Therefore, the option is incorrect.

Option D: tin is used to sort an alloy which is widely used in chemical vapour deposition and physical vapour deposition pellets. It is used in ballast casting.
Therefore, the option D is incorrect.

So, the correct answer is Option B.

Note:
We also remember that lead is a metal which has been used from ancient times for making paints and pipes as a corrosion resistant and also used for making coins. It is used in car batteries and as a primary ingredient in lead and batteries. Lead is used as electrodes in electrolysis processes.