Question

Assertion: All homogeneous substances are pure.
Reason: Alloys are a homogeneous mixture of solids.
(a) Both assertion and reason are correct and the reason is the correct explanation for assertion.
(b) Both assertion and reason are correct but the reason is not the correct explanation of assertion.
(c) Assertion is incorrect but the reason is correct
(d) Both assertion and reason are incorrect

Answer 1

While looking at the word homogeneous, homo means the same, thus homogeneous mixtures are those that can be mixed together equally and distributed in equal proportion so as to make it dissolved.

Complete answer:
We will look at both the statements to define whether the given statements are true or not. As we all know alloys are made up of two metals, thus it is a homogeneous mixture as it has the same substance. Thus we can say that alloy is a homogenous mixture of solids but that does not mean it is not pure. From the term homogeneous we can say that substances will have the same composition during the whole process. If we look at pure substances; they cannot be separated by physical process; on the other hand, homogeneous substances can be separated by physical methods.
Thus in this explanation we can conclude that the assertion is incorrect which says that all homogeneous substances are pure is not correct while the reason statement is correct which says that alloys are homogeneous mixture of solids and these solids are metals. So, option (c) is correct.

Additional Information:
We need to know that an alloy is a mixture of metallic solids that is made up of two or more elements. For example: Brass is an alloy of copper and zinc metal.

Note:
We need to know that the homogeneous and heterogeneous are two types of mixture that have different explanations. Homogeneous compounds as discussed above have the same composition of substance while heterogeneous mixtures have different compositions that are non uniform phases, which cannot be separated by physical methods.