An element A reacts with water to form a compound B which is used in white washing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.
A is calcium. It reacts with water to give calcium hydroxide. B is calcium hydroxide and is used for white washing. C is calcium oxide. The reactions are as follows:
Ca + 2H2O → Ca(OH)2 + H2
Ca(OH)2 → CaO + H2O
CaO + H2O → Ca(OH)2
