Answer: Sample A is a pure substance, Sample B is a homogeneous mixture and Sample C is a heterogeneous mixture.
Explanation:
Homogeneous mixture : In these mixture, all the component are uniformly distributed throughout the mixture.For example: sugar-water solution.
Heterogeneous mixture : In these mixture, all the component are not uniformly distributed throughout the mixture.For example: sand-water solution.
Pure substance : These are the substance made up only one type of atom or molecule.They have fixed value of boiling and melting points. For example: diamond, pure sugar etc.
Sample A is a clear liquid which evaporates at
with no change in appearance. Hence, pure substance.
Sample B is a clear blue liquid which boils at
and leaves blue crystals behind with change in appearance. Hence, homogeneous mixture
Sample C is a opaque, whitish liquid which boils at
and leaves white crystals behind with dust particles settled in the bottom. Hence, heterogeneous mixture.