Q53Short answer
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.
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A — Ca; B— Ca(OH)2; C — CaO Ca(s) + 2H2O → Ca(OH)2(aq) + H2 (g) Heat → CaO + H O Ca(OH)2 ⎯⎯⎯⎯ 2