Which of the following reaction increase production of dihydrogen from synthesis gas ?

Options

A. `CH_(4)(g) +H_(2)O(g) underset(Ni)overset(1270K)toCO(g) + 3H_(3)(g)`
B. `C(s) +H_(2)O(g) overset(1270K)to CO(g) +H_(2)(g)`
C. `CO(g) + H_(2)O(g) underset("Catalyst")overset(673K)to CO_(2)(g) +H_(2)(g)`
D. `C_(2)H_(6) +2H_(2)O underset(Ni)overset(1270K)to2CO + 5H_(2)`

Explanation

To solve the question regarding which reaction increases the production of dihydrogen from synthesis gas, we can follow these steps:

### Step 1: Understand Synthesis Gas
Synthesis gas, or syngas, is a mixture primarily composed of carbon monoxide (CO) and hydrogen (H2). It is produced through a process called coal gasification, where coal reacts with water to produce CO and H2.

**Hint:** Remember that synthesis gas is mainly made up of CO and H2.

### Step 2: Identify the Reaction to Increase Hydrogen Production
To increase the production of dihydrogen from synthesis gas, we can utilize the water-gas shift reaction. This reaction involves the reaction of carbon monoxide (CO) with steam (H2O) to produce carbon dioxide (CO2) and additional hydrogen (H2).

**Hint:** Look for reactions that involve CO and steam to produce more H2.

### Step 3: Write the Reaction Equation
The reaction can be represented as follows:
\[ \text{CO} + \text{H}_2\text{O} \xrightarrow{\text{catalyst, high temperature}} \text{CO}_2 + \text{H}_2 \]

This reaction is facilitated by a catalyst (such as iron chromate) and typically occurs at elevated temperatures (around 673 K).

**Hint:** The presence of a catalyst and high temperature is crucial for this reaction.

### Step 4: Analyze the Options
Given the options in the question, we need to identify which one corresponds to the reaction of CO with steam to yield CO2 and H2. The correct option will be the one that describes this reaction.

**Hint:** Look for the option that mentions CO reacting with steam to produce CO2 and H2.

### Conclusion
After analyzing the options, the correct answer is the one that describes the reaction of carbon monoxide with steam, which increases the production of dihydrogen from synthesis gas.

**Final Answer:** The third option is correct, as it represents the reaction of CO with steam to produce CO2 and H2, thereby increasing hydrogen production.