Commercial hydrogen is obtained from

Options

A. Coal gas
B. Water gas
C. Air
D. Producer gas

Answer

To answer the question "Commercial hydrogen is obtained from," we will follow these steps:

### Step 1: Understanding the Source of Commercial Hydrogen
Commercial hydrogen is primarily obtained from a process involving water gas. Water gas is a mixture of carbon monoxide (CO) and hydrogen (H2) produced by the reaction of steam with carbon.

### Step 2: The Reaction Involved
The reaction that produces water gas can be represented as:
\[ C + H_2O \rightarrow CO + H_2 \]
In this reaction:
- \( C \) represents carbon (in the form of coke or charcoal).
- \( H_2O \) is water in the form of steam.
- The products are carbon monoxide (CO) and hydrogen gas (H2).

### Step 3: Conditions for the Reaction
This reaction occurs when steam is passed over red-hot coke. The high temperature (red-hot) facilitates the endothermic reaction, allowing the conversion of water and carbon into carbon monoxide and hydrogen.

### Step 4: Conclusion
Thus, commercial hydrogen is obtained from water gas, which is produced through the reaction of steam with carbon.

### Final Answer
Commercial hydrogen is obtained from water gas.

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