Identify the weakest oxidising agent among the following.

Options

A. `Li^(+)`
B. `Na^(+)`
C. `Cd^(2+)`
D. `l_(2)`

Explanation

To identify the weakest oxidizing agent among the given options, we need to understand the properties of oxidizing agents and how they relate to the elements in question.

### Step-by-Step Solution:

1. **Understanding Oxidizing Agents**:
An oxidizing agent is a substance that causes another substance to be oxidized (lose electrons) while it itself gets reduced (gains electrons).

2. **Identifying the Options**:
The options provided are likely to include lithium ion (Li⁺), sodium ion (Na⁺), calcium ion (Ca²⁺), and iodine (I₂).

3. **Analyzing the Metals**:
- **Li⁺**: Lithium ion is a small cation. Due to its small size, it has a high charge density, which means it can attract electrons effectively, but it is not very favorable for gaining electrons because of electron-electron repulsion when it tries to gain more electrons.
- **Na⁺**: Sodium ion is larger than lithium ion, and while it can also attract electrons, it is less effective than lithium in that regard.
- **Ca²⁺**: Calcium ion is larger and has a +2 charge, making it a poorer oxidizing agent compared to Li⁺ and Na⁺ because it is less likely to gain electrons due to its larger size and lower charge density.

4. **Considering Non-Metals**:
- **I₂**: Iodine is a non-metal and is known to be a good oxidizing agent because it readily gains electrons to form iodide ions (I⁻).

5. **Comparing the Strengths**:
Among the options, the metals (Li⁺, Na⁺, Ca²⁺) are generally reducing agents, while I₂ is a strong oxidizing agent. Among the metals, Li⁺ is the smallest and has a higher tendency to gain electrons compared to Na⁺ and Ca²⁺, but due to its small size, it faces significant electron repulsion when trying to gain more electrons.

6. **Conclusion**:
Therefore, the weakest oxidizing agent among the options is **Li⁺** because it is less favorable for it to gain electrons compared to the others.

### Final Answer:
The weakest oxidizing agent among the given options is **Li⁺**.