Brass(B)
A solution is a homogeneous mixtures of two or more substance.....
Solid in Solid solutions consist solute as well as solvent in solid form. Brass consist of 30%of zinc and 70%copper......Hence it is a solid in solid solution in which copper is solvent and zinc is solute.......

Definition of Solid-Solid Solution

A solid-solid solution is a homogeneous mixture of two or more solid substances that form a single phase. In this type of solution, the atoms or molecules of the solute are uniformly distributed within the solvent's crystal lattice.

Examples of Solid-Solid Solutions

- Iron: Iron is an example of a solid-solid solution as it can form solid solutions with various elements like carbon, nickel, and manganese. These solid solutions exhibit properties different from pure iron, such as increased hardness and strength.

- Brass: Brass is another example of a solid-solid solution composed of copper and zinc. The two metals form a homogeneous mixture with properties different from each individual metal, such as improved corrosion resistance and malleability.

- Charcoal: Charcoal, on the other hand, is not a solid-solid solution. It is a porous form of carbon produced by heating organic materials in the absence of oxygen. Charcoal does not involve the mixing of different solid substances at the atomic level.

Conclusion

In conclusion, the correct answer to the question is D) all of the above, as both iron and brass are examples of solid-solid solutions, while charcoal is not. Solid-solid solutions play a crucial role in materials science and industry, as they can exhibit unique properties that are not present in the individual components.