The reactions in options A, C, and D all involve the liberation of hydrogen gas: A) Active metals like zinc react with dilute acids (Zn + H₂SO₄ → ZnSO₄ + H₂). C) Amphoteric metals like zinc react with strong bases upon heating (Zn + 2NaOH → Na₂ZnO₂ + H₂). D) Highly reactive metals like potassium react vigorously with water (2K + 2H₂O → 2KOH + H₂).
Which one of the following reactions does not result in the evolution of hydrogen gas ?
Asked in UPSC NDA 1 2021 · Topic: Hydrogen and Its Compounds (Preparation of Dihydrogen (H2): Laboratory and Industrial methods)
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Answer: B. Mixing water to Plaster of Paris
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