Potassium manganate (K₂MnO₄) is not more soluble in hexane than water. In fact, the opposite is true: potassium manganate is much more soluble in water than in hexane.

Here's why:

* Polarity: Water is a highly polar solvent, meaning it has a significant difference in charge distribution across the molecule. Potassium manganate is also an ionic compound, meaning it dissolves into charged ions (K⁺ and MnO₄⁻) in solution. Polar solvents like water effectively solvate ions, allowing them to dissolve.

* Non-polarity: Hexane, on the other hand, is a non-polar solvent. It doesn't have a significant charge separation and cannot effectively interact with the charged ions of potassium manganate.

Therefore, potassium manganate is much more soluble in water (a polar solvent) than in hexane (a non-polar solvent).

The "like dissolves like" principle applies here: polar substances dissolve well in polar solvents, and non-polar substances dissolve well in non-polar solvents.