In which of the following does carbon occur in its purest form in nature?

Options

A. carbon black
B. graphite
C. diamond
D. coal

Answer

To determine in which of the following options carbon occurs in its purest form in nature, let's analyze each option:

**Step 1: Understand the options provided.**
- A. Carbon Black
- B. Graphite
- C. Diamond
- D. Coal

**Step 2: Analyze each option.**
- **A. Carbon Black**: This is a form of carbon that is produced from the incomplete combustion of hydrocarbons. It contains impurities and is not considered pure carbon.

- **B. Graphite**: Graphite is a form of carbon that has a layered structure. While it is a good conductor of electricity and is used in pencils and lubricants, it is not entirely pure as it may contain other elements or compounds.

- **C. Diamond**: Diamond is a crystalline form of carbon where each carbon atom is tetrahedrally bonded to four other carbon atoms. This structure makes diamond the purest form of carbon found in nature, as it consists almost entirely of carbon atoms with very few impurities.

- **D. Coal**: Coal is a fossil fuel that contains a mixture of carbon, along with various other elements such as hydrogen, sulfur, oxygen, and nitrogen. It is not pure carbon.

**Step 3: Conclusion**
After analyzing the options, we can conclude that the purest form of carbon in nature is **C. Diamond**.