In processing of steel which of the following allotropes of carbon is used.

Options

A. Carbon black
B. Charcoal
C. Coke
D. Graphones

Explanation

To determine which allotrope of carbon is used in the processing of steel, we can follow these steps:

### Step 1: Identify the Allotropes of Carbon
Carbon has several allotropes, including:
- Diamond
- Graphite
- Graphene
- Carbon black
- Charcoal
- Coke

### Step 2: Analyze Each Allotrope's Use
- **Diamond**: Primarily used in cutting tools and jewelry, not in steel processing.
- **Graphite**: Used in lubricants and batteries, but not directly in steel processing.
- **Graphene**: A newer material with potential applications, but not commonly used in steel production.
- **Carbon Black**: Used as a pigment in inks and as a filler in rubber, not in steel processing.
- **Charcoal**: Used in various applications including filtration, but not primarily in steel processing.
- **Coke**: Produced from the destructive distillation of coal, it is used extensively in metallurgy as a reducing agent and fuel.

### Step 3: Conclusion
Based on the analysis, the allotrope of carbon used in the processing of steel is **Coke**.

### Final Answer
Coke is the allotrope of carbon used in the processing of steel.

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