Which property of sulphuric acid is shown by the reaction of concentrated sulphuric acid with:

(i) Dehydrating property

$\text{C}_{2}\text{H}_{5}\text{OH}\xrightarrow{\text{Conc. H}_2\text{SO}_4} \text{C}_{2}\text{H}_{4} \small{\space[ethene-ethylene]} + \text{H}_2\text{O}$

(ii) Oxidizing property

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