Which one of the following is NOT a heterogeneous mixture ?

A homogeneous mixture, or solution, has a uniform composition throughout, whereas a heterogeneous mixture consists of distinct phases. Sulphur is insoluble in water, forming a non-uniform suspension where particles remain visible or separate over time [2]. Similarly, sandy water and a mixture of sugar and salt crystals are heterogeneous because their components are not evenly distributed and can be distinguished as separate entities [2]. In contrast, sulphur is highly soluble in carbon disulphide (CS2). When sulphur dissolves in carbon disulphide, it forms a true solution where the sulphur molecules are uniformly dispersed at the molecular level, making it a homogeneous mixture. Therefore, sulphur in carbon disulphide is the only option that is NOT a heterogeneous mixture.

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 9: The Amazing World of Solutes, Solvents, and Solutions > What inspired Asima Chatterjee to work on medicinal plants? > p. 139
2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures > Prepare some questions based on your learnings so far ... ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... > p. 132