The amorphous solid among the following is

Options

A. Diamond
B. Graphite
C. Glass
D. Common salt.

Explanation

To determine which of the given options is an amorphous solid, we can follow these steps:

### Step 1: Understand the Definition of Amorphous Solids
Amorphous solids are materials whose constituent particles (atoms, molecules, or ions) are not arranged in a long-range ordered structure. Instead, they have a disordered arrangement, which means they lack a definite geometric shape or crystalline structure.

**Hint:** Remember that amorphous solids have no long-range order and are often referred to as "non-crystalline."

### Step 2: Analyze Each Option
We will evaluate each of the given options to see if they fit the definition of an amorphous solid.

1. **Diamond**: Diamond is a crystalline form of carbon where the carbon atoms are arranged in a very specific and regular three-dimensional structure. Therefore, it is not an amorphous solid.

**Hint:** Crystalline solids have a well-defined geometric arrangement.

2. **Graphite**: Graphite is another crystalline form of carbon, where the carbon atoms are arranged in layers. Each layer has a hexagonal arrangement, making graphite a crystalline solid.

**Hint:** Look for regular patterns in the arrangement of particles to identify crystalline solids.

3. **Glass**: Glass is a well-known example of an amorphous solid. It lacks a long-range order in its atomic structure, making it disordered. This is why glass is often referred to as a "pseudo solid."

**Hint:** Amorphous solids like glass do not have a repeating pattern in their structure.

4. **Common Salt**: Common salt (sodium chloride, NaCl) is a crystalline solid. The sodium and chloride ions are arranged in a regular, repeating pattern, characteristic of crystalline materials.

**Hint:** Check if the substance has a defined lattice structure to determine if it is crystalline.

### Step 3: Conclusion
Based on the analysis of each option, the only material that fits the definition of an amorphous solid is **glass**.

**Final Answer:** The amorphous solid among the following is **glass**.