Chemistry
The gas evolved when concentrated sulphuric acid reacts with zinc
- Sulphur dioxide
- Carbon dioxide
- Hydrogen sulphide
- Hydrogen
Sulphuric Acid
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Answer
Sulphur dioxide
Reason — Concentrated sulphuric acid acts as a strong oxidising agent when it reacts with zinc; zinc is oxidised to zinc sulphate (ZnSO4) and the acid is reduced, liberating sulphur dioxide (SO2) gas.
Zn + 2H2SO4 ⟶ ZnSO4 + 2H2O + SO2 ↑
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