What is the gas evolved when zinc reacts with sulphuric acid?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. Hydrogen.
When zinc (Zn) reacts with sulphuric acid (H₂SO₄), hydrogen gas (H₂) is evolved, and zinc sulphate (ZnSO₄) is formed. This is an example of a single displacement reaction where zinc displaces hydrogen from sulphuric acid.
Why not the other options?
- Oxygen (O₂) – Not produced in this reaction.
- Carbon dioxide (CO₂) – Produced when acids react with carbonates or bicarbonates, not with zinc.
- Hydrogen sulphide (H₂S) – Formed when sulphides react with acids, but zinc is not a sulphide.