Solid Solution:

Solid solution refers to a type of homogeneous mixture where two or more substances are uniformly dispersed at the atomic or molecular level within a solid phase. In a solid solution, the atoms or molecules of the solute are incorporated into the crystal lattice of the solvent, resulting in a single solid phase with a uniform composition throughout.

Sol:

On the other hand, a sol is a colloidal suspension where solid particles are dispersed in a liquid medium. It is a type of heterogeneous mixture where the solid particles are not dissolved but rather dispersed and suspended in the liquid. The solid particles in a sol are typically very small and can range from nanometers to micrometers in size.

Differences:

1. Nature:
- Solid Solution: Solid solutions are homogeneous mixtures where the solute is dissolved in the solvent at the atomic or molecular level, resulting in a single solid phase.
- Sol: Sols are heterogeneous mixtures where solid particles are dispersed and suspended in a liquid medium, creating a colloidal suspension.

2. Phase:
- Solid Solution: Solid solutions exist as a single phase with a uniform composition throughout the entire mixture.
- Sol: Sols are heterogeneous mixtures consisting of two phases - the solid particles and the liquid medium.

3. Particle Size:
- Solid Solution: In solid solutions, the solute particles are typically of atomic or molecular size and are evenly distributed within the solvent lattice.
- Sol: In sols, the solid particles are larger than the solute particles in solid solutions and are dispersed as colloidal particles in the liquid medium.

4. State of Matter:
- Solid Solution: Solid solutions are in the solid state of matter, where the solute atoms or molecules are incorporated into the crystal lattice of the solvent.
- Sol: Sols are in the liquid state of matter, where the solid particles are dispersed and suspended in the liquid medium.

5. Visibility:
- Solid Solution: Solid solutions are usually transparent and do not exhibit the Tyndall effect since the solute particles are dissolved at the atomic or molecular level.
- Sol: Sols can exhibit the Tyndall effect, where the dispersed solid particles scatter light, making the sol appear cloudy or opaque.

In summary, solid solutions and sols differ in their nature, phase, particle size, state of matter, and visibility. Solid solutions are homogeneous mixtures of solute dissolved in a solvent at the atomic or molecular level and exist as a single solid phase. On the other hand, sols are heterogeneous mixtures where solid particles are dispersed and suspended in a liquid medium, creating a colloidal suspension.

Sol. is a colloid in which tiny solid particles are dispersed in a liquid medium. The examples are ink, soap solution, paints etc.solid sol. is a colloid in which solid particles are dispersed in a solid medium. The examples are colored gemstones.