When zinc is added to dilute sulphuric acid, the gas evolved is
A{'text': 'Hydrogen (H₂)', 'label': 'A'}
B{'text': 'Carbon dioxide (CO₂)', 'label': 'B'}
C{'text': 'Oxygen (O₂)', 'label': 'C'}
D{'text': 'Sulphur dioxide (SO₂)', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Hydrogen (H₂)', 'label': 'A'}
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 NCERT lab test for hydrogen gas.
_Source: NCERT Class 10 Science, Ch 3 "Metals and Non-metals", §3.2.3_
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