Identify the non-metals on the basis of their uses:
(i) Non-metal essential for all living beings.
(ii) Non-metal used in fertilizers to enchance growth of plants.
(iii) Non-metal used in water purification process.
(iv) Non-metal used in purple coloured solution which is applied on wounds and used as an antiseptic.
(v) Non-metal used in crackers.

Explanation

To identify the non-metals based on their uses, we can analyze each use mentioned in the question step by step.

### Step-by-Step Solution:

1. **Non-metal essential for all living beings:**
- The non-metal that is essential for all living beings is **Oxygen**. It is crucial for respiration and is required by most organisms to survive.

2. **Non-metal used in fertilizers to enhance growth of plants:**
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