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An element A reacts with water to form a compound B which is used in white washing.

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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 is calcium, B is calcium Hydroxide and C is Calcium Oxide. 

Ca + 2H2O → Ca(OH)2+ H2 

Ca(OH)2 → CaO + H2O 

CaO + H2O → Ca(OH)2

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