PASSAGE-I : Diamond and graphite are two allotropic forms of carbon which are crystalline in nature. They differ physically but chemically they are similar. Diamond is the hardest crystalline form of carbon. In diamond each carbon atom is linked to four other carbon atoms by covalent bonds. In graphite, each carbon atom is linked to three other carbon atoms by covalent bond. Graphite is relatively soft and greasy. It is a good conductor or electricity.
Which allotrope gives carbon dioxide on heating?

Options

A. Graphite
B. Diamond
C. Coal
D. All of these

Answer

To determine which allotrope of carbon gives carbon dioxide on heating, we can analyze the properties of diamond and graphite based on the information provided.

### Step-by-Step Solution:

1. **Understanding Allotropes**:
- Allotropes are different forms of the same element that have different physical properties but similar chemical properties. In this case, we are looking at carbon's allotropes: diamond and graphite.

2. **Chemical Composition**:
- Both diamond and graphite are composed entirely of carbon atoms. Therefore, they have the potential to react chemically in similar ways.

3. **Heating and Combustion**:
- When carbon-based materials are heated in the presence of oxygen, they undergo combustion, which typically produces carbon dioxide (CO₂) as a product.

4. **Analyzing Diamond and Graphite**:
- **Diamond**: When diamond is heated, it can react with oxygen to produce carbon dioxide.
- **Graphite**: Similarly, graphite can also react with oxygen when heated to produce carbon dioxide.

5. **Conclusion**:
- Both allotropes, diamond and graphite, will produce carbon dioxide when heated in the presence of oxygen. Therefore, the answer to the question is that both diamond and graphite can give carbon dioxide on heating.

### Final Answer:
Both diamond and graphite give carbon dioxide on heating.