Which of the following is a good conductor of electricity ?

Options

A. charcoal
B. coke
C. graphite
D. diamond

Explanation

To determine which of the following is a good conductor of electricity, we can analyze the properties of the materials in question. Here’s a step-by-step solution:

### Step 1: Understand Electrical Conductivity
Electrical conductivity refers to the ability of a material to allow the flow of electric current. Good conductors have free-moving electrons that can carry charge.

### Step 2: Identify the Materials
Assuming we have a list of materials (for example: metals like copper, aluminum, and non-metals like graphite), we need to evaluate their conductivity.

### Step 3: Evaluate Each Material
- **Metals (e.g., Copper, Aluminum)**: Metals are generally good conductors of electricity because they have a high density of free electrons that can move easily through the lattice structure.
- **Graphite**: Graphite is a form of carbon that has a layered structure. Within these layers, there are free electrons that can move, allowing graphite to conduct electricity.
- **Non-Metals (e.g., Sulfur, Phosphorus)**: Most non-metals do not have free electrons and are poor conductors of electricity.

### Step 4: Conclusion
Among the materials analyzed, graphite is a good conductor of electricity due to the presence of delocalized electrons in its layered structure. Therefore, if graphite is one of the options, it would be the correct answer.

### Final Answer
**Graphite is a good conductor of electricity.**

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