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Which of the following can be used to prepare hydrogen gas in the laboratory?

1. Mercuric oxide
2. Acid plus zinç
3. Potassium chlorate
4. Carbon disulfide E. Benzene

Correct answer: Acid plus zinç

Solution

Zinc reacts with dilute acids to produce hydrogen gas, making it a common laboratory preparation method. The other options are used for different reactions or do not generate hydrogen under normal lab conditions.

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