Among solids highest mp is observed for

Options

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

Answer

To determine which type of solid has the highest melting point among the given options (covalent solids, ionic solids, pseudosolids, and molecular solids), we will analyze each type of solid based on their bonding and structure.

### Step-by-Step Solution:

1. **Understanding Covalent Solids:**
- Covalent solids are formed by atoms that are bonded together through covalent bonds, which involve the sharing of electron pairs.
- Examples include diamond and silicon carbide.
- These solids tend to have high melting points due to the strong covalent bonds that need to be broken to change the solid into a liquid.

**Hint:** Covalent solids are characterized by strong bonds due to shared electrons.

2. **Understanding Ionic Solids:**
- Ionic solids consist of ions held together by strong electrostatic forces of attraction between oppositely charged ions (e.g., NaCl).
- The melting points of ionic solids are generally very high because a significant amount of energy is required to overcome these strong ionic bonds.

**Hint:** Ionic solids are formed from charged ions and have very strong electrostatic attractions.

3. **Understanding Pseudosolids:**
- Pseudosolids, such as glass, are not true solids but rather supercooled liquids.
- They do not have a fixed melting point; instead, they soften over a range of temperatures.

**Hint:** Pseudosolids behave like solids at room temperature but are actually supercooled liquids.

4. **Understanding Molecular Solids:**
- Molecular solids are composed of molecules held together by weaker intermolecular forces such as van der Waals forces, hydrogen bonds, or dipole-dipole interactions.
- These solids typically have lower melting points compared to covalent and ionic solids.

**Hint:** Molecular solids are held together by weaker forces compared to ionic and covalent solids.

5. **Comparing Melting Points:**
- Among the four types of solids:
- Covalent solids have high melting points due to strong covalent bonds.
- Ionic solids have even higher melting points due to strong ionic bonds.
- Pseudosolids do not have a fixed melting point.
- Molecular solids have the lowest melting points due to weak intermolecular forces.
- Therefore, ionic solids exhibit the highest melting points among the given options.

### Conclusion:
The type of solid that has the highest melting point among the options provided is **ionic solids**.