Which of the following is an oxidising agent ?

Options

A. `[Mn(CO)_5]`
B. `[Fe(CO)_5]`
C. `[Mn_2(CO)_(10)]`
D. `[Fe_2(CO)_9]`

Answer

To determine which of the given compounds is an oxidizing agent, we need to analyze the options provided: MnCO5, FeCO5, Mn2CO10, and Fe2CO9.

### Step-by-Step Solution:

1. **Understanding Oxidizing Agents**:
An oxidizing agent is a substance that can accept electrons from another species, thereby causing the other species to be oxidized. The oxidizing agent itself gets reduced in the process.

2. **Analyzing Each Compound**:
- **MnCO5**: Manganese in this compound can accept electrons to achieve a more stable electronic configuration. When it accepts an electron, it forms MnCO5- which has a stable electronic configuration similar to that of Krypton (Kr).
- **FeCO5**: Iron typically does not exhibit strong oxidizing properties in this form and is more likely to act as a reducing agent.
- **Mn2CO10**: This compound has manganese in a different oxidation state, and it is less likely to act as an oxidizing agent compared to MnCO5.
- **Fe2CO9**: Similar to FeCO5, iron in this compound does not show strong oxidizing behavior.

3. **Conclusion**:
Among the options, MnCO5 is the only compound that acts as an oxidizing agent because it can accept electrons to form a more stable anion (MnCO5-), which corresponds to a high effective nuclear charge and a stable electronic configuration.

### Final Answer:
**MnCO5 is the oxidizing agent.**

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