alleryWhen zinc is added to dilute sulphuric acid, the gas evolved is
AHydrogen (H₂)
BCarbon dioxide (CO₂)
COxygen (O₂)
DSulphur dioxide (SO₂)
Answer & Solution
Correct answer: A. Hydrogen (H₂)
1. Zinc is more reactive than hydrogen in the activity series.
2. Zn displaces H₂ from dilute H₂SO₄: Zn + H₂SO₄ → ZnSO₄ + H₂↑.
3. The gas evolved (H₂) burns with a pop sound on bringing a lighted matchstick to it.
4. This is the standard syllabus lab test for hydrogen gas.
_Source: syllabus Science, Ch 3 "Metals and Non-metals", §3.2.3_
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