When steam is passed over hot coke, it produces

Options

A. producer gas
B. synthesis gas
C. tear gas
D. coal gas

Explanation

To solve the question "When steam is passed over hot coke, it produces," we can follow these steps:

### Step 1: Understand the Components
- **Hot Coke**: Coke is a form of carbon, often used in industrial processes.
- **Steam**: Steam is the gaseous form of water (H₂O).

### Step 2: Identify the Reaction
When steam (H₂O) is passed over hot coke (C), a chemical reaction occurs. The carbon in the coke reacts with the steam.

### Step 3: Write the Chemical Equation
The reaction can be represented by the following equation:
\[ C + H_2O \rightarrow CO + H_2 \]
This means that one molecule of carbon reacts with one molecule of water to produce one molecule of carbon monoxide (CO) and one molecule of hydrogen gas (H₂).

### Step 4: Identify the Product
The products of this reaction are:
- Carbon monoxide (CO)
- Hydrogen gas (H₂)

### Step 5: Name the Product
The mixture of carbon monoxide and hydrogen gas produced from this reaction is known as:
- **Synthesis gas** or **Water gas**.

### Conclusion
Thus, when steam is passed over hot coke, it produces synthesis gas (water gas).

### Final Answer
The correct answer is **synthesis gas**.

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