Which of the following gas molecules have minimum value of enthalpy of chemisorption on an iron surface?

Options

A. `C_2H_6`
B. Ne
C. `H_2O`
D. `H_2`

Explanation

To determine which gas molecule has the minimum value of enthalpy of chemisorption on an iron surface, we need to analyze the nature of the bonds formed between the gas molecules (adsorbates) and the iron surface (adsorbent).

### Step-by-Step Solution:

1. **Understanding Chemisorption**:
- Chemisorption involves the formation of chemical bonds between the adsorbate (gas molecules) and the adsorbent (iron surface). The strength of these bonds influences the enthalpy of chemisorption.

2. **Identifying the Molecules**:
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