Write the equation for each of the following reactions:
(i) Sulphur is heated with concentrated sulphuric acid.
(ii) Concentrated sulphuric acid is poured over sugar.

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Solution

(i) When sulphur is heated with concentrated sulphuric acid, it is oxidised to sulphur dioxide:

S + 2H₂SO₄ → 2H₂O + 3SO₂

(ii) Concentrated sulphuric acid chars the sugar, leaving behind carbon as the residue:

C₁₂H₂₂O₁₁ + Conc. H₂SO₄ → 12C + 11H₂O

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Write the equation for each of the following reactions: (i) Sulphur is heated with concentrated sulphuric acid. (ii) Concentrated sulphuric acid is poured over sugar.

(i) When sulphur is heated with concentrated sulphuric acid, it is oxidised to sulphur dioxide: S + 2H2SO4 → 2H2O + 3SO2 (ii) Concentrated sulphuric acid chars the sugar, leaving behind carbon as the residue: C12H22O11 + Conc. H2SO4 → 12C + 11H2O

Write the equation for each of the following reactions:
(i) Sulphur is heated with concentrated sulphuric acid.
(ii) Concentrated sulphuric acid is poured over sugar.

(i) When sulphur is heated with concentrated sulphuric acid, it is oxidised to sulphur dioxide:

S + 2H₂SO₄ → 2H₂O + 3SO₂

(ii) Concentrated sulphuric acid chars the sugar, leaving behind carbon as the residue:

C₁₂H₂₂O₁₁ + Conc. H₂SO₄ → 12C + 11H₂O