Sulphuric acid is manufactured by Contact process. Which reaction involves the catalyst?
A. H₂S₂O₇ + H₂O → 2H₂SO₄
B. SO₃ + H₂SO₄ → H₂S₂O₇
C. S + O₂ → SO₂
D. SO₂ + O₂ → SO₃
Answer: Option D
Solution (By JKExamLibrary)
In the Contact process, the key catalytic step is oxidation of SO₂ to SO₃ using V₂O₅ (vanadium pentoxide) catalyst at 450°C: 2SO₂ + O₂ ⇌ 2SO₃. Sulfur burning is non-catalytic. The SO₃ is absorbed in 98% H₂SO₄ to form oleum (H₂S₂O₇), then diluted to get concentrated H₂SO₄. Direct dissolution of SO₃ in water is avoided due to mist formation.
Explanation:
The thermite reaction involves aluminum powder reacting with iron(III) oxide to produce molten iron and aluminum oxide (2Al + Fe₂O₃ → Al₂O₃ + 2Fe). It is highly exothermic and is used for welding railway tracks and repairing metal structures in the field.
Explanation:
HCl is oxidized (Cl⁻ → Cl₂, loss of electrons), so it acts as the reducing agent. MnO₂ is reduced (Mn⁴⁺ → Mn²⁺) and is the oxidizing agent.
Explanation:
CNG (methane) has a higher H/C ratio, so combustion produces less CO₂ per unit energy compared to petrol/diesel. It also burns completely without generating smoke or particulate matter, and contains no sulfur, thus no SO₂. It reduces NOx and unburned hydrocarbons. It is used in vehicles and is safer in spills because it is lighter than air and disperses quickly.
No comments yet. Be the first to start the discussion!