There is a lot of energy absorbed or released during a formation of a mixture.
Mixture: If two or more substances are mixed together in any proportion such that they do not undergo any chemical change but retain their individual properties then the resulting mass is called a mixture.
Example: Air, salt solution, Sugar solution, etc.
Characteristics of mixtures:
Energy change: No exchange of energy takes place during the formation of a mixture.
Thus, the given statement is false.