Question

rs from diamond c. Graphite was heated in excess air and the gas given off passed through aqueous calcium hydroxide for a long time i.

Answer 1

When Graphite was heated in excess air, $CO_2$ gas is produced. The gas react with aqueous calcium hydroxide to form a white precipitate.

$Ca(OH)_2 (aq)+CO_2(g) \to CaCO_3(white \space ppt)+H_2O(l)$

With excess $CO_2$ the white precipitate turns colorless.

$CaCO_3+CO_2\to Ca(HCO_3)_2(colorless \space solution)$