Which one of the following reactions does not result in the evolution of hydrogen gas ?
Reaction of zinc metal with dilute sulphuric acid solution
Mixing water to Plaster of Paris
Heating zinc metal with sodium hydroxide solution
Reaction of potassium metal with water
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-1 – 2021
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).