Question

Assertion: All homogenous substances are pure.

Reason: Alloys are homogeneous mixtures of solids.

• A. Both assertion and reason are correct and reason is the correct explanation for assertion
• B. Both assertion and reason are correct but reason is not the correct explanation for assertion
• C. Assertion is correct but reason is incorrect
• D. Assertion is incorrect but reason is correct

Answer 1

The correct option is D

Assertion is incorrect but reason is correct

Explanation for assertion:-

• The term homogeneous means that the substance has the same composition throughout.
• These substances can be separated by using lots of physical methods.
• On the other hand pure substances are those substances that cannot be physically separated without breaking their chemical chain and are generally made up of one type of particles only.
• Thus if a substance is homogenous that does not mean that it is pure as well.
• Thus assertion is false.

Explanation for reason:-

• Alloys are homogeneous mixtures of two or more metals or solids.
• But as the alloy is considered homogenous, it doesn’t mean that it has to be pure.
• Some examples of alloys are: Bronze(copper and tin), Alnico(Aluminium, Cobalt, Nickle)
• Thus the reason is true,

Therefore, option (D) Assertion is incorrect but reason is correct is the correct answer.