Among solids, the highest melting point is exhibited by

Options

A. Amorphous solids
B. Ionic solids
C. Pseudo solids
D. Molecular solids

Answer

To determine which type of solid exhibits the highest melting point among the given options (amorphous solids, ionic solids, pseudo solids, and molecular solids), we can analyze the nature of bonding in each type of solid.

### Step-by-Step Solution:

1. **Understanding the Types of Solids:**
- **Amorphous Solids:** These solids do not have a definite crystalline structure and their particles are arranged randomly. Examples include glass and plastics. They generally have lower melting points due to weaker intermolecular forces.
- **Ionic Solids:** These solids consist of ions held together by strong electrostatic forces of attraction (ionic bonds). Examples include sodium chloride (NaCl) and magnesium oxide (MgO). They typically have high melting points due to the strength of these ionic bonds.
- **Pseudo Solids:** This term is not commonly used in solid-state chemistry, but it may refer to materials that exhibit some solid-like properties while being more fluid in nature. Their melting points can vary widely and are generally lower than those of ionic solids.
- **Molecular Solids:** These solids are composed of molecules held together by weaker van der Waals forces or hydrogen bonds. Examples include ice (solid water) and sugar. They usually have lower melting points compared to ionic solids.

2. **Analyzing the Melting Points:**
- The melting point of a solid is influenced by the strength of the forces holding its particles together. Stronger bonds require more energy to break, resulting in higher melting points.
- Ionic solids have strong electrostatic forces of attraction between oppositely charged ions, which leads to very high melting points.

3. **Conclusion:**
- Among the options provided, ionic solids exhibit the highest melting point due to the strong ionic bonds that require significant energy to overcome.

### Final Answer:
**Ionic solids exhibit the highest melting point among the given options.**

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