Give balanced equation(s) for :

(a) Reaction of dilute sulphuric acid when poured over sodium sulphite

(b) Manufacture of sulphuric acid by the Contact process.

(c) Heating sulphur with conc. sulphuric acid

(d) Dehydration of sugar crystals by conc. sulphuric acid

(e) Action of concentrated sulphuric acid on carbon.

(a) Na₂SO₃ + H₂SO₄ (dil.) ⟶ Na₂SO₄ + H₂O + SO₂

(b) Contact process:

Sulphur or Pyrite Burner:
S + O₂ ⟶ SO₂
4FeS₂ + 11O₂ ⟶ 2Fe₂O₃ + 8SO₂

Contact Tower :

$2\text{SO}$2 + \text{O}2 \xrightleftharpoons[450-500\text{\degree C }/1 - 2 \text{ atmos}]{\text{V}2\text{O}5} 2\text{SO}_3 + 45 \text{ K cals}

Absorption Tower :
SO₃ + H₂SO₄ ⟶ H₂S₂O₇

Dilution Tank:
H₂S₂O₇ + H₂O ⟶ 2H₂SO₄

(c) S + 2H₂SO₄ [conc.] ⟶ 3SO₂ + 2H₂O

(d) $\underset{\text{Cane Sugar}}{\text{C}${12}\text{H}{22}\text{O}{11}} \text{ (s)} \xrightarrow{\text{Conc. H}2\text{SO}4} \underset{\text{Sugar Charcoal}}{12\text{C (s)}} + 11\text{H}2\text{O}

(e) C + 2H₂SO₄ [conc.] ⟶ CO₂ + 2H₂O + 2SO₂