Question

Which of the following statements about a mixture is true?

• A. It is a pure substance.
• B. Formation of a mixture is a physical change.
• C. Its constituents retain their individual properties.
• D. It is always homogeneous.

Answer 1

Answer: (B), (C)

Its constituents retain their individual properties.

In formation of a mixture, the mixing of the respective constituents is a physical change. No new substance is formed, only the constituents are physically mixed. A mixture is not a pure substance as its constituents retain their individual properties.
It can be either homogeneous (uniform composition throughout) or heterogeneous (non-uniform composition).