Pure hydrogen burns in pure oxygen, with a flame that produces very high temperature and droplets of a colourless liquid fall.
(i) What is this flame called ? (ii) What is its colour and (iii) for what purpose is it used?

Explanation

To answer the question step by step, we will break it down into three parts as specified in the question.

### Step-by-Step Solution:

**(i) What is this flame called?**

1. **Identify the Reaction**: Pure hydrogen (H2) burns in pure oxygen (O2).
2. **Chemical Reaction**: When hydrogen reacts with oxygen, it produces water (H2O) and releases heat.
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