Properties of solid depend upon

Options

A. nature of constituent particles
B. binding force operating between them
C. both(1) and (2)
D. Neither I nor II

Answer

To answer the question "Properties of solid depend upon," we need to analyze the factors that influence the properties of solids.

### Step-by-Step Solution:

1. **Identify the Nature of Constituent Particles**:
- The properties of solids are influenced by the type of particles that make up the solid. For example, solids can be made of atoms, ions, or molecules, and the nature of these particles (e.g., size, mass, charge) affects properties like density, hardness, and melting point.

**Hint**: Consider how different types of particles (like metals vs. non-metals) exhibit different physical properties.

2. **Examine the Binding Forces**:
- The strength and type of forces that hold the constituent particles together also play a crucial role. For example, ionic bonds, covalent bonds, and metallic bonds have different strengths and characteristics, which directly influence the solid's properties such as brittleness, conductivity, and thermal stability.

**Hint**: Think about how the strength of bonds affects the stability and behavior of a solid under stress.

3. **Combine Both Factors**:
- The properties of a solid are not determined by just one of these factors but rather by the combination of both the nature of the constituent particles and the binding forces between them. Therefore, both factors are essential in determining the overall properties of a solid.

**Hint**: Reflect on how the interaction between particle types and their bonding can lead to unique material properties.

4. **Conclusion**:
- Based on the analysis, we can conclude that the properties of solids depend on both the nature of the constituent particles and the binding forces operating between them.

**Final Answer**: The correct option is "both 1 and 2."