State the observation seen when conc. H₂SO₄ is added to –

(i) sucrose

(ii) hydrated copper [II] sulphate.

(i) Conc. H₂SO₄ dehydrates sucrose to a black spongy charged mass of carbon sugar charcoal.

$\text{C}${12}\text{H}{22}\text{O}{11}\xrightarrow{\text{Conc. H}2\text{SO}4} \text{12C} \small{\space[sugar\space charcoal]} + \text{11H}2\text{O}

(ii) The blue coloured hydrous copper sulphate changes to white anhydrous copper sulphate as the water of crystallization is removed.

$\text{CuSO}$4\text{.5H}2\text{O} \xrightarrow{\text{Conc. H}2\text{SO}4} \text{CuSO}4 \text{ [White Anhydrous]} + 5\text{H}2\text{O}