Using the concept of oxidation number, identify the substances undergoing oxidaton and reduction in the following reactions.
`Cr_(2)O_(3)+2Al to2Cr+Al_(2)O_(3)`

Explanation

To identify the substances undergoing oxidation and reduction in the reaction \( \text{Cr}_2\text{O}_3 + 2\text{Al} \rightarrow 2\text{Cr} + \text{Al}_2\text{O}_3 \), we will follow these steps:

### Step 1: Write the reaction clearly
The reaction is given as:
\[ \text{Cr}_2\text{O}_3 + 2\text{Al} \rightarrow 2\text{Cr} + \text{Al}_2\text{O}_3 \]

### Step 2: Assign oxidation numbers
- For \( \text{Cr}_2\text{O}_3 \):
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