Name any one metal which is preferred for the preparation of hydrogen from cold water

Explanation

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks for a metal that can be used to prepare hydrogen from cold water.

2. **Identify Reactive Metals**: The metals that are preferred for this reaction are those that are highly reactive and are positioned above hydrogen in the electrochemical series.

3. **List of Suitable Metals**: The highly reactive metals that can react with cold water include sodium (Na), potassium (K), and calcium (Ca).

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