Question

Assertion: Alloys are commonly used in electrical heating devices like electric iron and heaters.
Reason: Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points than their constituent metals. Explain?
A. Both assertion and reason are correct and reason is the correct explanation of assertion.
B. Both assertion and reason are correct but reason is not the correct explanation of assertion.
C. The assertion is correct but the reason is incorrect.
D. Both assertion and reason are incorrect.

Answer 1

Hint: It is possible to make an alloy out of a metal and a nonmetal. As a result, it possesses properties of both metal and nonmetal. Because it is an alloy, the ions in it are organized in a random manner. This substance does not have a particular arrangement of ions.

Complete answer:
As a result, the flow of electrons is greater in this case. This property of the alloy causes an increase in resistivity because of the free crystal lattice. Knowing that metals have high melting points, we can understand why an alloy has a low melting point. This is due to the existence of a nonmetal in the alloy, which acts as an impurity and prevents the alloy from reaching a high melting point. Because of the high melting point, it takes a significant amount of current to melt the material, resulting in a sluggish flow of electrons, which reduces the efficiency of the device. A low melting point metal is required for electrical devices because of this. When it comes to electronic devices such as electric irons and heaters, alloys are the most effective.
Alloys are combinations of metals or metals and other elements. Certain other metals/elements can be added to the metals in specific ratios to form alloys to confer certain properties to metals or strengthen some of their present properties. In simple words an alloy is a homogeneous mixture of two or more metals or a metal and a nonmetal.
Therefore, Both assertion and reason are correct and reason is the correct explanation of assertion. Option (A) is correct.

Note:
For example, pure aluminum is a relatively soft metal. Pure copper is also quite soft. However, when aluminum is alloyed with copper, the resulting alloy’s strength is far greater than that of its parent metals. The other important examples of alloys are listed below.
-Steel
-Nichrome
-Bronze
-Brass
-Duralumin
-Solder