Question

Write balanced chemical equations to show – 

• The oxidizing action of cone, sulphuric acid on carbon. 
• The behaviour of H₂SO₄ as an acid when it reacts with magnesium. 
• The dehydrating property of cone, sulphuric acid with sugar. 
• The conversion of SO₃ to sulphuric acid in the Contact process. 

Answer 1

1. C + 2H₂SO₄ (cone.) → CO₂ + 2SO₂ + 2H₂O 

2. Mg + H₂SO₄ (dil.) → MgSO₄ + H₂ (g) 

3. C₁₂H₂₂O₁₁ + 11 H₂SO₄ (conc.) → 12C + 11H₂SO₄ .H₂O + ΔH 

4. (a) SO₃+ H₂SO₄ (cone.) → H₂S₂O₇ (oleum) 

(b) H₂S₂O₇ + H₂O → 2H₂SO₄ (cone.)