A group of students carried out electrolysis of acidified water in the laboratory. By the end of the experiment two gases were collected in the test tubes at both the electrodes.
The gas collected in one test tube is double the volume of gas collected in the other. Name this gas. Give reason for your answer.

Explanation

To solve the question, we need to analyze the electrolysis of acidified water and the gases produced during the process.

### Step-by-Step Solution:

1. **Understanding Electrolysis of Water**:
- When water (H₂O) is subjected to electrolysis, it breaks down into its constituent elements. This process involves passing an electric current through the water, which is acidified (usually with sulfuric acid) to increase conductivity.

2. **Products of Electrolysis**:
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