SSC MTS EXAM

Detailed explanation-1: -A pure substance always has a definite and constant composition. A mixture is a physical combination of two or more pure substances in which each substance retains its own chemical identity. A pure substance is a single substance on its own. Elements and compounds are pure substances, but mixtures are not.

Detailed explanation-2: -Pure substances have a definite composition, are homogeneous, and include elements and compounds. Mixtures do not have a definite composition and may be homogeneous or heterogeneous.

Detailed explanation-3: -The properties of mixture vary because it depends on the type of substance present and on the proportion of the substance being mixed. On the other hand, compounds have a fixed composition and have definite properties.