Question

6) Which of these is NOT a pure substance?
A) elements B) compounds C) mixtures D) they are all pure substances​

Answer 1

Answer:

C) A mixture is not a pure substance

Answer 2

Explanation:

from the given option mixture is not a pure substance because it can be formed by mixing a randomly two or more than two substance in any proportion.

for pure substance the object should combine with a fixed proportion.