Statement I : All compounds contain more than one element. Statement II : All compounds are heterogeneous mixtures.

Statement I is true because a compound is defined as a substance composed of two or more different elements that are chemically combined in a fixed ratio [1]. For example, water (H2O) is a compound containing hydrogen and oxygen. Statement II is false because compounds are classified as pure substances and are always homogeneous in nature [1]. Unlike mixtures, which can be either homogeneous or heterogeneous and consist of physically blended components that retain their individual properties, compounds have a uniform composition throughout and possess entirely new chemical properties different from their constituent elements [1]. Because the components of a compound are chemically bonded, they cannot be separated by physical means, whereas mixtures can be separated using methods like filtration or evaporation.

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures > Snapshots > p. 130