Dipping iron article into a strongly alkaline solution of sodium phosphate :

Options

A. Does not affect the article
B. Form `Fe_(2)O_(3) . xH_(2)O`
C. Form iron phosphate film
D. Forms ferric hydroxide

Explanation

To solve the question regarding the effect of dipping an iron article into a strongly alkaline solution of sodium phosphate, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components**:
- We have an iron article (Fe) and a strongly alkaline solution of sodium phosphate (Na₃PO₄).

2. **Understand the Electrochemical Series**:
- The electrochemical series ranks elements based on their standard electrode potentials. In this series, metals that are higher can displace those that are lower from their compounds in solution.

3. **Position of Iron and Sodium in the Series**:
- In the electrochemical series, sodium (Na) is placed above iron (Fe). This means that sodium has a higher tendency to lose electrons (oxidize) compared to iron.

4. **Displacement Reaction Consideration**:
- Since sodium is above iron in the electrochemical series, it has the potential to displace iron from its compounds. However, in this case, we are dealing with sodium phosphate, which does not contain iron in a form that can be displaced.

5. **Reaction Analysis**:
- When iron is dipped into sodium phosphate solution, there is no significant reaction because sodium does not react with iron to form a new compound. The iron does not have the tendency to displace sodium from sodium phosphate.

6. **Formation of Iron Phosphate**:
- Although iron can react with phosphates, in the presence of a strongly alkaline solution, iron tends to form a protective layer of iron hydroxide (Fe(OH)₂ or Fe(OH)₃) rather than being displaced or corroded.

7. **Conclusion**:
- Since there is no reaction occurring that affects the iron article, we conclude that dipping the iron article into a strongly alkaline solution of sodium phosphate does not affect it.

### Final Answer:
The correct answer is that dipping an iron article into a strongly alkaline solution of sodium phosphate does not affect the article.

---