The percentage of ozone in ozonised oxygen is about ____.

Answer

To solve the question regarding the percentage of ozone in ozonized oxygen, we can follow these steps:

### Step 1: Understand the Formation of Ozone
When electric discharge is passed through dry oxygen (O₂), ozone (O₃) is formed. The reaction can be represented as:
\[ 3O_2 \rightleftharpoons 2O_3 \]
This indicates that three molecules of oxygen can produce two molecules of ozone.

**Hint:** Remember that ozone is formed from oxygen through a specific process involving electric discharge.

### Step 2: Recognize the Nature of Ozonized Oxygen
Ozonized oxygen is a mixture of ozone and unreacted oxygen. Not all oxygen molecules are converted into ozone during this process, which means the mixture consists of both O₂ and O₃.

**Hint:** Consider that the process is not 100% efficient, leading to a mixture of products.

### Step 3: Determine the Percentage of Ozone
In ozonized oxygen, the percentage of ozone is typically around 10%. This means that in the mixture of ozone and oxygen, ozone constitutes about 10% of the total volume.

**Hint:** Look for standard values or common knowledge regarding the composition of ozonized oxygen.

### Step 4: Conclusion
Thus, the percentage of ozone in ozonized oxygen is approximately 10%.

**Final Answer:** The percentage of ozone in ozonized oxygen is about **10%**.