Based on the physical states of the solvent and solute, the nine types of solutions in chemistry are:

1. Gas in Gas: A gaseous solute is dissolved in a gaseous solvent. An example is air, which is a mixture of different gases.
2. Gas in Liquid: A gaseous solute is dissolved in a liquid solvent. An example is carbonated water, where carbon dioxide gas is dissolved in water.
3. Gas in Solid: A gaseous solute is dissolved in a solid solvent. An example is hydrogen gas dissolved in palladium metal.
4. Liquid in Gas: A liquid solute is dissolved in a gaseous solvent. An example is water vapor in air, such as humidity in the atmosphere.
5. Liquid in Liquid: A liquid solute is dissolved in a liquid solvent. Examples include ethanol (liquid) dissolved in water (liquid) to form alcoholic beverages.
6. Liquid in Solid: A liquid solute is dissolved in a solid solvent. An example is mercury (liquid) dissolved in silver (solid) to form dental amalgam.
7. Solid in Gas: A solid solute is dissolved in a gaseous solvent. An example is smoke, where solid particles are dispersed in the air.
8. Solid in Liquid: A solid solute is dissolved in a liquid solvent. Examples include sugar (solid) dissolved in water (liquid) or salt (solid) dissolved in water to form a saline solution.
9. Solid in Solid: A solid solute is dissolved in a solid solvent. An example is alloys, such as brass (a mixture of copper and zinc).

These different types of solutions based on the physical states of the solvent and solute demonstrate the diverse ways in which substances can dissolve and interact with each other.