MCQ
Which one of the following statements is incorrect:
- AAll elements are homogeneous
- BCompounds made up of a number of elements are homogeneous
- CA mixture is not always heterogeneous
- DAir is a heterogeneous mixture
Explanation:
All elements and compounds are homogeneous, as they are pure substances.
A mixture can be homogeneous or heterogeneous.
So, options A, B and C are correct statements.
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