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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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Element A is calcium (Ca). When it reacts with water, it forms calcium hydroxide. Thus, compound B is calcium hydroxide [Ca(OH)2], which is used in white washing. 

Compound 8 on heating gives CaO.

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