Which one is very soft in nature?

Options

A. Ionic crystal
B. Covalent crystal
C. Metallic crystal
D. Molecular crystal

Explanation

To determine which type of crystal is very soft in nature, we can analyze the different types of crystals mentioned in the question. Here’s a step-by-step solution:

### Step 1: Understand the types of crystals
There are four main types of crystals:
1. **Ionic Crystals**: Formed by ionic bonds, these crystals are generally hard and brittle due to strong electrostatic forces between oppositely charged ions.
2. **Covalent Crystals**: These are formed by covalent bonds and typically have a very strong structure, making them hard (e.g., diamond).
3. **Metallic Crystals**: Composed of metal atoms, they have a sea of delocalized electrons, which allows them to be malleable and ductile, but they are not classified as soft.
4. **Molecular Crystals**: These are formed by molecules held together by weaker intermolecular forces (like van der Waals forces, hydrogen bonds, etc.).

### Step 2: Compare the hardness of each type
- **Ionic Crystals**: Hard and brittle due to strong ionic bonds.
- **Covalent Crystals**: Very hard due to strong covalent bonds.
- **Metallic Crystals**: Generally malleable but not soft.
- **Molecular Crystals**: Soft because the intermolecular forces are much weaker compared to ionic or covalent bonds.

### Step 3: Identify the softest crystal type
From the comparison, it is clear that molecular crystals are the softest among the four types of crystals due to the weak forces holding them together.

### Conclusion
Thus, the correct answer to the question "Which one is very soft in nature?" is **Option 4: Molecular Crystal**.

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