The strongest reducing agent is

Options

A. K
B. Al
C. Mg
D. Br

Answer

To determine the strongest reducing agent among Potassium, Aluminium, Magnesium, and Fibromium, we will analyze their positions in the periodic table and their respective properties.

### Step-by-Step Solution:

1. **Identify the Elements and Their Groups:**
- Potassium (K) is in Group 1 (1A).
- Aluminium (Al) is in Group 13 (3A).
- Magnesium (Mg) is in Group 2 (2A).
- Fibromium (F) is not a valid element in this context; it seems to be a typographical error for Bromine (Br), which is in Group 17 (7A).

2. **Understanding Reducing Agents:**
- A reducing agent is a substance that donates electrons in a chemical reaction and gets oxidized in the process.
- The strength of a reducing agent is often related to how easily it can lose electrons.

3. **Periodic Trends:**
- As we move from left to right across a period in the periodic table, the electronegativity increases and the atomic radius decreases.
- Elements on the left side of the periodic table (like alkali metals) tend to lose electrons more easily compared to those on the right side (like halogens).

4. **Comparison of Elements:**
- Potassium (K) is an alkali metal and has a larger atomic radius compared to Aluminium and Magnesium. This means it can lose its outermost electron more easily.
- Magnesium (Mg) is also a metal but is located further to the right than Potassium, making it a weaker reducing agent than Potassium.
- Aluminium (Al) is a metalloid and is even less likely to lose electrons compared to Potassium.
- Bromine (Br) is a non-metal and is not a reducing agent; it tends to gain electrons instead.

5. **Conclusion:**
- Among the given options, Potassium (K) is the strongest reducing agent because it has the largest atomic radius and the lowest electronegativity, allowing it to lose electrons easily.

### Final Answer:
The strongest reducing agent is **Potassium (K)**.