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Which of the following methods can produce hydrogen of very high purity (99.9%)?

1. Passing methane over steam
2. Blending natural hydrocarbons with large molecular mass
3. Electrolyzing water
4. Treating hydride salts with water

Correct answer: Electrolyzing water

Solution

Electrolyzing water separates hydrogen and oxygen through an electrical current, resulting in hydrogen that is highly pure, typically reaching purities of 99.9% or higher.

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