Explain how individual gases can be separated from a gaseous mixture of `O_2, H_2 and CO_2`.

Explanation

To separate individual gases from a gaseous mixture of \(O_2\), \(H_2\), and \(CO_2\), we can follow these steps:

### Step 1: Pass the mixture through caustic potash (KOH)
- **Explanation**: The gaseous mixture containing \(O_2\), \(H_2\), and \(CO_2\) is passed through a solution of caustic potash (potassium hydroxide, KOH).
- **Reason**: \(CO_2\) reacts with KOH and is absorbed, while \(O_2\) and \(H_2\) will pass through unaffected.

### Step 2: Reaction of \(CO_2\) with KOH
- **Chemical Reaction**:
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