State true or false
Diamond is a crystalline form of carbon which is good conductor of electricity.

Explanation

To determine whether the statement "Diamond is a crystalline form of carbon which is a good conductor of electricity" is true or false, we can follow these steps:

### Step 1: Identify the nature of diamond
- Diamond is indeed a crystalline form of carbon. It is one of the allotropes of carbon, which means it is a different structural form of the same element.

### Step 2: Understand the electrical conductivity of diamond
- To assess whether diamond is a good conductor of electricity, we need to look at its electronic structure. Diamond has a tetrahedral structure where each carbon atom is bonded to four other carbon atoms through strong covalent bonds.

### Step 3: Analyze the presence of free electrons
- In diamond, all the valence electrons of carbon are involved in bonding (sp³ hybridization). This means that there are no free electrons available to carry an electric charge.

### Step 4: Conclude on electrical conductivity
- Since there are no free electrons in diamond, it cannot conduct electricity. In fact, diamond is considered an insulator or a poor conductor of electricity.

### Final Conclusion
- Therefore, the statement "Diamond is a crystalline form of carbon which is a good conductor of electricity" is **False**.

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