For the reaction shown below, which statement is true ?
`2Fe+3CdCl_(2)hArr 2FeCl_(3)+3Cd`

Options

A. Fe is the oxidizing agent
B. Cd undergoes oxidation
C. Cd is the reducing agent
D. Fe undergoes oxidation

Answer

To determine which statement is true regarding the reaction:

\[ 2Fe + 3CdCl_2 \rightleftharpoons 2FeCl_3 + 3Cd \]

we will analyze the oxidation states of the elements involved in the reaction.

### Step 1: Identify the oxidation states of the reactants and products.
- **Iron (Fe)**: In the reactants, iron is in the elemental form, which has an oxidation state of **0**. In the product \(FeCl_3\), iron has an oxidation state of **+3**.
- **Cadmium (Cd)**: In cadmium chloride \(CdCl_2\), cadmium has an oxidation state of **+2**. In the product \(Cd\), cadmium is in its elemental form, which has an oxidation state of **0**.

### Step 2: Determine the changes in oxidation states.
- **Iron (Fe)**: The oxidation state changes from **0** to **+3**. This indicates that iron is losing electrons and is therefore being **oxidized**.
- **Cadmium (Cd)**: The oxidation state changes from **+2** to **0**. This indicates that cadmium is gaining electrons and is therefore being **reduced**.

### Step 3: Identify the oxidizing and reducing agents.
- **Reducing Agent**: The substance that gets oxidized (loses electrons) is the reducing agent. Here, iron is being oxidized, so it is the **reducing agent**.
- **Oxidizing Agent**: The substance that gets reduced (gains electrons) is the oxidizing agent. Here, cadmium is being reduced, so it is the **oxidizing agent**.

### Step 4: Evaluate the statements.
1. **Iron is the oxidizing agent**: This statement is **false** (iron is the reducing agent).
2. **Cadmium undergoes oxidation**: This statement is **false** (cadmium undergoes reduction).
3. **Cadmium is the reducing agent**: This statement is **false** (cadmium is the oxidizing agent).
4. **Iron undergoes oxidation**: This statement is **true** (iron is oxidized from 0 to +3).

### Conclusion
The correct statement is: **Iron undergoes oxidation**.